Hello and thank you for your answer.
I checked and how strange, I only have a readme.txt file at this place.
I never installed any IDE distrib because I usually prefer to download a full portable ZIP file that I unzip (usually onto my desktop). I thought this way of doing would be easier for me to update my IDE distrib.
My way of proceeding is
1) to download this file :
https://github.com/digistump/DigistumpArduino/releases/download/v1.5.8B/DigistumpIDE1.5.8B.zip2) to unzip onto my desktop
3) to go to the directory
4) to run arduino.exe
5) to load the example
6) to click on Verify button.
7) Then, the detailed error log is here:
Arduino : 1.5.8 (Windows 8), Carte : "Digispark (Default - 16.5mhz)"
Utilisation de la bibliothèque OneWire prise dans le dossier : C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire (legacy)
Utilisation de la bibliothèque DigiUSB prise dans le dossier : C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB (legacy)
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -MMD -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\Digispark_Example.cpp -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\Digispark_Example.cpp.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -MMD -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire\utility C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire\OneWire.cpp -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\OneWire\OneWire.cpp.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-gcc -c -g -x assembler-with-cpp -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\utility C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrvasm.S -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\DigiUSB\usbdrvasm.S.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-gcc -c -g -Os -w -ffunction-sections -fdata-sections -MMD -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\utility C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\oddebug.c -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\DigiUSB\oddebug.c.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-gcc -c -g -Os -w -ffunction-sections -fdata-sections -MMD -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\utility C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\osccal.c -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\DigiUSB\osccal.c.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B/hardware/tools/avr/bin/avr-gcc -c -g -Os -w -ffunction-sections -fdata-sections -MMD -mmcu=attiny85 -DF_CPU=16500000L -DARDUINO=158 -DARDUINO_AVR_DIGISPARK -DARDUINO_ARCH_AVR -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\cores\tiny -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\variants\digispark -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\OneWire -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB -IC:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\utility C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c -o C:\Users\Padawan\AppData\Local\Temp\build1161291681959543057.tmp\DigiUSB\usbdrv.c.o
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:70:14: error: variable 'usbDescriptorString0' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
PROGMEM char usbDescriptorString0[] = { /* language descriptor */
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:70:14: error: conflicting types for 'usbDescriptorString0'
In file included from C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:12:0:
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.h:515:6: note: previous declaration of 'usbDescriptorString0' was here
char usbDescriptorString0[];
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:80:14: error: variable 'usbDescriptorStringVendor' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
PROGMEM int usbDescriptorStringVendor[] = {
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:80:14: error: conflicting types for 'usbDescriptorStringVendor'
In file included from C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:12:0:
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.h:521:5: note: previous declaration of 'usbDescriptorStringVendor' was here
int usbDescriptorStringVendor[];
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:89:14: error: variable 'usbDescriptorStringDevice' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
PROGMEM int usbDescriptorStringDevice[] = {
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:89:14: error: conflicting types for 'usbDescriptorStringDevice'
In file included from C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:12:0:
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.h:527:5: note: previous declaration of 'usbDescriptorStringDevice' was here
int usbDescriptorStringDevice[];
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:111:14: error: variable 'usbDescriptorDevice' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
PROGMEM char usbDescriptorDevice[] = { /* USB device descriptor */
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:111:14: error: conflicting types for 'usbDescriptorDevice'
In file included from C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:12:0:
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.h:491:6: note: previous declaration of 'usbDescriptorDevice' was here
char usbDescriptorDevice[];
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:142:14: error: variable 'usbDescriptorConfiguration' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
PROGMEM char usbDescriptorConfiguration[] = { /* USB configuration descriptor */
^
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:142:14: error: conflicting types for 'usbDescriptorConfiguration'
In file included from C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.c:12:0:
C:\Users\Padawan\Desktop\DigistumpIDE1.5.8B\hardware\digistump\avr\libraries\DigiUSB\usbdrv.h:497:6: note: previous declaration of 'usbDescriptorConfiguration' was here
char usbDescriptorConfiguration[];
^
Erreur lors de la compilation.Do you think I could have missed an old file hidden somewhere or an option in a Roaming\preference file or may be in the RegDatabase ?
Sorry for disturbing

and many (many, many) thanks for your help