Im using Windows 10 and Win 10 only has 64bit so im kinda confused. Do I need to re-install the game for this or will the patch do the work?
1 - There are 32bit versions of Win 10.
2 - Win 10 64bit can run 32 and 64 bit applications.
3 - It should auto select the 64bit version if you have 64bit windows. In the launcher you can change the settings to launch the 32 bit version if you need.
4 - No reinstall needed.