I’ve split this topic since it does not appear to be related to the previous issue.
Please download the EBB driver directly from this link:
Then, try running that installer, to see if it gives you any issues. If not, then try connecting from within Inkscape again. Try a different USB cable, if you have one available, and try a different USB port on your computer.
If you’re still having trouble, please try a manual upgrade to the latest version of the EggBot software.
(1) Download this ZIP file: https://github.com/evil-mad/EggBot/releases/download/v2.8.0/eggbot2.8b_Windows.zip
(2) Copy the entire contents of the “extensions” directory from that zip archive to your Inkscape extensions directory, overwriting the files there. Typically, your extensions directory is located at:
C:\Program Files\Inkscape\share\extensions\ or
C:\Program Files (x86)\Inkscape\share\extensions\