Just in case, could you try this version which includes the RTP?
https://mega.nz/file/MBxgHISb#95KWsDk6cr4S2d5pBrwd2TbeN_TL3g3oYPGPip29cP8
Nope, both the standalone and the RTP versions are unstable with Windows 11. I guess RPG Maker VX Ace is too old a format? Might be no more fully compatible with 64 bit systems.
