Corrupt Game Data

Okay, I need some help here, I downloaded an RCMP vehicle pack off the LSPDFR site, (Link Below), and I replaced all the vehicle models with the ones from the pack in OpenIV, in the vehicle.rpf, and changed out a few uniforms and ped props from  another pack I downloaded in their respective rpfs as well. I finally switched out the vehicle meta with the one that came with the pack in it's e respective rpf, and when I launch the game now it crashes and gives the corrupt data error message. If anyone else has had this happen and knows how to fix it, please let me know. I don't really want to reinstall the game and/or mods unless absolutely necessary, as my PC is slow for downloading. Thanks!!