sgc not downloading

[RockstarFoxy26]

whenever i open the sgc launcher, it gives me the popup telling me that it's not yet downloaded to my computer. so i click yes to download it, and it just closes after a few seconds without actually installing it.

does anyone know a fix for this? or can i just download the game itself without the launcher?

[Krazii]

https://www.mediafire.com/file/d640wbb8r...n.zip/file