: Similar to SteamCTL, this tool allows you to download game files directly from Valve's servers using your credentials. It is the primary way users "downgrade" games to previous patches.
The primary driver for the development and distribution of these tools is not always malicious intent; rather, it is often framed by the community as a necessity for and preservation . As official servers for older titles are deprecated, third-party tools become the only viable method to experience the software as it was originally intended.