Having issues with some mods- 64-bit issue?

[tepid radish]

I'm having issues with two particular addons. First, this:
https://steamcommunity.com/sharedfiles/filedetails/?id=1267287732
One of the two models in the pack is broken and appears as a glitchy mess. It works fine in Source Filmmaker and both model viewers, and was working a while back, so I assume it's to do with being on the 64 bit branch?

Second, this:
~~https://steamcommunity.com/sharedfiles/filedetails/?id=3224582601~~
The grappling hook doesn't function at all, which causes the vmanip function to break, the viewmodel just sticks its arm out and doesn't fire anything, also giving my view a leftwards roll that can only be fixed by respawning. I assume this is either again being on the 64 bit branch, or a discrepancy in the default button being F in the grapple.lua file
Other people are also having issues with it, so it's not just me.

EDIT: With the Grapple it turns out you actually need to have a certain weapon equipped; someone even posted right after me to check the second screenshot. Still, the addon shouldn't be breaking the default camera angle like that...

[jolly fog]

the model appears to be just broken (it prints errors in console when loaded), but x86-64 appears to handle that worse than the main game, the grappling hook seems to work fine on both versions of the game for me

[tepid radish]

The grappling hook was just user error on my end, I managed to make it work, but I think it comes out too fast. For the broken model, what exactly is the error you're getting on the main branch?

[jolly fog]

there are a bunch of errors (they appear on all versions of the game, because model is improperly made), but the important one is the last one