IMPORTANT: Uninstall any and all store apps in ModifiableWindowsApp and shut down any running apps running out of ModifiableWindowsApp
Additional note: This will likely not resolve any NP errors, those are related to Gameguard
Step 1: Install something, anything from the microsoft store to C : this is just to establish the directory structure of C:\Program Files\ModifiableWindowsApps ( you probably already have this directory )
Step 2: Download https://sourceforge.net/projects/symlink-creator/ its a tool that will let you trick windows into thinking its writing data to (C:\your directory here) but in reality will be writing to wherever you tell it to with this program
Step 3: Run the tool as an administrator and in the top drop down box choose "Directory Symbolic Link (/D)"
Step 4: In the (Source Target): box press browse and select the folder ModifiableWindowsApps in C : at C:\Program Files\ModifiableWindowsApps
Step 5: Go to the drive you want the game to be installed to and create a folder named "ModifiableWindowsApps" in that location, if you already have one there or some version of that, delete it.
Step 6: In the Destination (Link): box select the folder ModifiableWindowsApps on the drive where you created it in step 5
Step 7: Click "Create Link" at the bottom of the program and confirm the next window that will ask you to say yes to replace the folder.
Reinstall PSO 2 and create a shortcut to the game by dragging the app icon for PSO2 to your desktop or wherever you want and launch by that link as administrator from now on, and you should not have anymore issues.
Please note that using PSO2 tweaker while using this method will likely break your game and will not work anyway