Hi @EH4472. You can work around this with a procedure similar to what I provided above. However, there are some differences since you are using Windows instead of macOS. I'll provide instructions for Windows users:
- Click the following link:
https://web.archive.org/web/20251012082117/https://azduino.com/bin/micronucleus/micronucleus-cli-2.5-azd1b-x86_64-mingw32.zip
Your web browser will start a file download. - Wait for the file download to finish.
- Use Windows File Explorer to copy the downloaded file to the folder at the following path on your hard drive:
(whereC:\Users\<username>\AppData\Local\Arduino15\staging\packages<username>is your Windows username)
If looking for it with your file manager or command line, note that the AppDatafolder is hidden by default. On Windows "File Explorer", you can make it visible by opening the "View" menu, then checking the box next to "☐ Hidden items".
Now try installing ATTinyCore again using Boards Manager, just as you did before. Hopefully this time it will be successful.