Problem:
User encounters error message, “Error 1001. Could not find file ‘C:\Program Files (x86)\Common Files\LP360\LP360CustomActions.InstallState.” or
“Error 1001. Could not find file ‘C:\Program Files\Common Files\LP360\LP360CustomActions.InstallState.”, while attempting to install LP360 v2018.1 or later.

Probable Resolution:
Uninstall all instances of LP360 from the machine, then attempt to install the latest version of LP360.