PC. Windows 10 to be specific
1
If you don't have the "rpg maker vx ace rtp" installed you will have to download it (preferably) or download the rtp file from the downloads.
2 (with rtp installed)
You only have to download the game and play.
3 (with rtp installed)
To apply a patch you only have to extract the patch and move the files to the game folder and replace all the files.
2 (with rtp downloaded)
To apply a patch extract it and move the files to the rtp folder and replace all the files.
