array_key_exists ERROR updating to GS 3.2.1

[shawn_a]

Well the wiki clearly says
http://get-simple.info/wiki/installation:upgrade

"If you don't want to overwrite everything because for instance you have customised or edited your old files or themes then the minimum you need to upload is the folder /admin/ and the file index.php ."

For now, I will just add that verbatim to the readme as well and a link to it, since the readme only has install instructions.

Then start thinking about adding index to health check somehow, or removing code from it.