the old social club launcher for GTA V used to have some problems starting or towards the end of the download where some stopping and resuming often fixed it for me but i think this is just some rockstar launcher or rockstar download server issue but maybe someone can find something in your log
Not sure what solution/problem you're referring to? All that launcher does is run the main executable when you click "PLAY" in the launcher. So to launch through LaunchBox/Big Box all you need to do is make the application path for the game entry in LaunchBox to be the game's exe.
In September 2019, Rockstar Games announced that they had released their own game launcher, a digital distribution, digital rights management, multiplayer and communications service.[30] After having taken an extended break following the release of Red Dead Redemption 2 in early 2019, Dan Houser left Rockstar Games on March 11, 2020.[31]
Rockstar Games released its own games launcher for Windows on September 17, 2019. The launcher integrates with the user's Social Club account, allowing them to download and buy games that they have previously purchased through Rockstar's store, as well as launch Rockstar games available from other services, like Steam, from the launcher.[64]
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