Files with this exact naming convention are frequently hosted on and often bundled with malware.
Downloading game updates via .rar parts from non-official sources exposes your system to trojans, miners, or ransomware. Hunt.Down.The.Freeman.Update.1.part1.rar
Right-click the game in Steam > Properties > Betas. Select the owf_development_build for the most stable, community-fixed version. Files with this exact naming convention are frequently