I tried to intalling codesys 64 3.5.19.0, during the installation process I get the following messages:
"One or more problems have appeared with the current version profile. please consult with the supplier to solve the problem.
-The plugin '{ee08241a-dd43-445a-b0a1-de9f717d92e0}(exactly 3.5.19.0)' is required for the current version profile but is not installed.
The plug-in '{c7880c90-68c0-4cf8-a726-f0ee72b11f86}(exactly 3.5.19.0)' is required for the current version profile but is not installed.
The add-on '{973a3934-1ec6-4770-83a4-59677803015a}(exactly 3.5.19.0)' is required for the current version profile but is not installed.
It is recommended to terminate the application."
Then the following message appears:
"This package could not be installed: CODESYS Compatibility Package 3.5.17.20”.
After that the instalation continue and the folling message appears:
"It is possible that packages from this path could not be installed: C:\Users...\Appdata\Local\Temp{EFE2F~1}\Packages"

Are you running the installer with admin privileges?