Alternatively, if you prefer using the command line, you can use 7-Zip or similar tools.
This archive contains the standalone files for Kerbal Space Program version 1.12.5.3190 , the final official update released by Squad and Private Division. This version is widely considered the definitive "gold standard" for the game, offering the best stability and the widest compatibility with the extensive library of community mods. Key Features of v1.12.5: kerbalspaceprogramv1125rar
This blog post provides an overview of Kerbal Space Program (KSP) v1.12.5 Alternatively, if you prefer using the command line,
Updates to the Paradox/Private Division launcher systems. kerbalspaceprogramv1125rar
It sounds like you may have come across a filename like kerbalspaceprogramv1125rar in an article or forum post. A few quick notes: