I haven't used Arduino for a few years on a couple of computers. Today, I updated to 1.8.19-windows.exe. Now I get the "could not load keywords.txt...." error on both systems that run Windows 10 Pro.
I removed everything related to Arduino, did the uninstalls and reinstalls, deleted Arduino15 directory. Even copied the keywords.txt and preferences.txt to the Arduino15 directory that Arduino creates every time the exe runs.
What is the problem? Why can't Arduino load a file that is located at C:\Program Files (x86)\Arduino\lib\keywords.txt??