For those who don't want to wait for a new Scripthook version and who are on Steam, look at downgrading your game version. There is a Steam Community Guide on this if you use Google to search for 'downgrade steam game version'.

I don't know how strict this site is so I don't want to just paste what to do in your Steam Console, but on steamdb you want the Depot that contains GTA5 and GTA5Launcher (when you click a Depot the Files will show) and the Manifest from 4 days ago should work.

As I hadn't backed up those files myself I couldn't just copy them over as some suggest, but doing that I was able to download the older (1737.0) files and boot up GTAV with all my mods. I don't know how stable the game is this way as I haven't played much, but it's something.