The official home of Script Hook V is . However, the author usually only hosts the latest version. Finding legacy builds like 1.0.877.1 requires trusted archival sources.
The most critical rule of using Script Hook V is to never attempt to enter GTA Online while mods are installed. Script Hook V is designed to close the game if it detects an Online session attempt, but manual tampering can lead to a permanent account ban. Script Hook V - Native Trainer 1.0.877.1 Download