This model pack contains only the latest version of each model. This is the pack you want if you play on server with the .hipoly plugin (twilightzone). Otherwise, you may still see missing models because of players using different model names.
This pack includes all models in this database. It should fix more missing models if you play on a server that doesn't enforce the latest "official" model names. Models that don't have version suffixes will likely be the oldest versions.