Can't get rid of old hardware/cores reference.

[bvernham]

I did a clean install of 1.8.13 on Windows 10 oro and I can not compile anything because is is looking for hardware/cores that no longer exist.
Every time I try to compile anything I get: loading hardware from C:\Program Files (x86)\Arduino\hardware: loading package mighty-1284P: invalid version dir C:\Program Files (x86)\Arduino\hardware\mighty-1284P\mighty-1284p-1.6.3\avr: no major version found
I looked in the registry and the environmental variables and could not find anything.
I have not had that hardware installed and have tried doing fresh IDE installs and also using CC cleaner. I can not find the GCC environment variable to delete so I am not sure where to find the setting to get rid fo the "mightly 1284P" hardware.
I don't have this issue with the "APP" from the APP store.
Any ideas?

Thanks

[pert]

This has nothing to do with registry or environment variables. The cause of the error is purely the presence of this folder:

C:\Program Files (x86)\Arduino\hardware\mighty-1284P\mighty-1284p-1.6.3

The correct installation structure looks like this:

C:\Program Files (x86)\Arduino\hardware\mighty-1284P
|_ avr
|_ boards.txt
|_ etc.

So just move the avr folder up one folder level, delete the C:\Program Files (x86)\Arduino\hardware\mighty-1284P\mighty-1284p-1.6.3 folder, and that issue will be resolved.