1. Delete the GarenaPoE folder in C:Program Files (x86) folder.
2. Log in to Garena plus, go to PoE, click on Install Path of Exile, and click Install.
3. Follow the instruction until you see the Completing the Garena - Path of Exile Setup Wizard window.
4. Close the window and go to C:Program Files (x86)GarenaPoEGameDataAppsPoE, double click PathOfExile.exe to run (There's no need to run as administrator). The window should show Checking Resources -> Allocating Space -> Downloading. (Note: you should not log off your Garena plus before this step, and do not attempt to click Start Path of Exile button on Garena plus panel until you complete this step.)
5. When Downloading completes, you can go back to Garena plus panel and click Start Path of Exile. You should be able to log in game normally now. (Note: You now will not be able to go in game through PathOfExile.exe anymore.)