Adb server version (40) doesn't match this client(41); killing...’ or similar error.

This means you may have another version of ADB installed on your PC that is conflicting with the version SideQuest uses. Try searching your hard drive for adb.exe and remove any that are not contained within SideQuest folders. Sometimes apps will add additional ADB environment settings to your PC, these should be removed also. In the windows search bar type PC > right click This PC and click Properties then click Advanced System Settings on the top left. Click Environment Variables on the bottom of the window that opens then check both of those white boxes for ANDROID_ADB_SERVER_PORT or any other entries that include ADB and delete them if you find any. Save and close those windows and restart SideQuest