Which package is needed for the game?
For different games, you may need a specific package. It all depends on the developer and on what kind of RPG Maker engine he made this game.
If there is no mention of the required RPG RTP in the design, then look in the "readme" game file or in the ini file.
The easiest method is to install all the packages and forget about them.
Contents of the archive:
Vx_rtp202.zip
Vxace_rtp100.zip
Xp_rtp103.exe
Xp_rtp104e.exe
2003rtp.exe
2000rtp.ехе
Other:
RGSS301.dll
RGSS103J.dll
RGSS-RTP-Standard-pt-br.exe
RXUP103.exe