By Nyarlko 2018-11-27 07:11:50
Simply copying over the files will not work. The process that I've used before when doing this is:
1. Install the game as normal via the official installer available on POL.
2. Copy over the existing install on top of the new one.
3. Find and delete a random .dat file. Smaller is better since it will be redownloaded.
4. Run the Repair Files function in POL Viewer.
You need to run the installer no matter what. Windows programs that have to be "installed" need to make entries in the registry in order to run properly. If you try to skip this part, the game will not run.
After you run the installer for the base program, then you should be able to safely overwrite the files (since there are now entries in the registry.)
Deleting a .dat file ensures that the File Repair will detect a problem and update your new install to the current version.