The version is an older build of the game. Since split RAR archives are usually created by specific repackers or file-sharing sites, you must go back to the exact website or forum where you found "part01" to find the matching "part02."
Look in the folder where you downloaded the files for any files ending in . ARK Survival Evolved v321.14.part02.rar
Studio Wildcard - ARK: Survival Evolved is Free To Own! - Steam The version is an older build of the game
If the uploader included a "Recovery Record," WinRAR can often fix the corruption without a redownload. 4. Alternative: Use Official Sources ARK Survival Evolved v321.14.part02.rar