There is no official product named for PC. While a "Classic Edition" was released for consoles like PS4 and Xbox One, PC players still use the original 2012 version, which already supports higher resolutions and graphical settings than the base console releases.
Far Cry 3 Classic edition not for FC3 owners - Steam Community
The specific download title you mentioned—"Far Cry 3 Remastered v1.5 Game for PC Highly Compressed Hakux"—appears to be a community-labeled repack or modded version rather than an official Ubisoft release. Key Facts About the Version Mentioned
There is no official product named for PC. While a "Classic Edition" was released for consoles like PS4 and Xbox One, PC players still use the original 2012 version, which already supports higher resolutions and graphical settings than the base console releases.
Far Cry 3 Classic edition not for FC3 owners - Steam Community
The specific download title you mentioned—"Far Cry 3 Remastered v1.5 Game for PC Highly Compressed Hakux"—appears to be a community-labeled repack or modded version rather than an official Ubisoft release. Key Facts About the Version Mentioned