According to patch notes from SteamDB , this update was referred to as "illegally smol" and included the following changes:
.rar (a WinRAR compressed archive), commonly used for distributing game files or "repacks" on third-party sites. Update Highlights (v1.0.5.643) CARRION.v1.0.5.643.rar
Files ending in .rar from unofficial sources often carry a high risk of malware or unwanted software. If you did not download this from an official store like Steam or GOG , it is recommended to scan it with updated antivirus software before opening. Illegally smol update - CARRION - SteamDB According to patch notes from SteamDB , this