I'm unable to install.
I actually have the 3.18 version installed already, and it works perfectly. Can't remember what I did to install it
Tried installing the 3.21, different folder, all clean: can't make it work.
I followed the instructions. Installed and uninstalled the RTP in different places to see if it would work and it doesn't.
I get the message "Unable to find file Graphics/Windowskins/004-Custom01".
EDIT: Also tried both the RTP in the link from Installation in this website, and the one that comes in the game folder. Neither seem to work. Manual says to use "RGSS-RTP_104" but there's no file with that name
EDIT 2: now with version 3.22b, I've unzipped, clicked on setup and chose to repair both option (it was already installed). Then I've clicked in the file explorer to show hidden folders/archives, and run the game. It now works, perfectly as it seems.