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make sure you're ticking the box to build morphs and have a .tri file in your folder along with the meshes.

you just have to adjust the actor positions. there's nothing else you can do. those animations are all made by different people using different skeletons or characters with different body types or scaling or whatever else and you have to adapt the animations to your own configuration.

Yes, he has one here: https://www.patreon.com/vectorplexus But since he quit modding, there's no reward to be a patron, unless maybe the funds are going towards maintaining the site or something like that. Sadly I think the reason he stopped is not so simple as just money.

You can find it in this thread. the forearm partition needs to be added in the esp and the mesh. in the esp, the "first person flags" needs to be edited in the armor addon section to include forearms. in the mesh, you can add the partition in outfit studio in the partition window (upper right)

It looks like an issue related to the way you chopped the body. I can see the vertices in the neck going crazy when I move the samson and samuel sliders in outfit studio. Start with a fresh body and make sure to follow the directions carefully to remove vertices.

It's not a replacer. He has made a replacer pack for clothing which you can find here: I believe it includes something similar for fine clothes

some of those older refits are using a .tri file format which the newer versions of outfit studio can't load. If you import it into an older version of outfit studio and then export it again from there, you should get a .tri file which can be used in your current version. I don't remember what the cutoff version is exactly, but I've told someone in the past to use 4.5.4 and that worked for them.

Try changing the game data path in the outfit studio settings. Instead of directing it to your mod organizer folder, direct it to the skyrim data folder.

which is odd, because looking at the error messages you're getting, the files are trying to go into mod organizer's mod folder. If you're not running it through MO, you should have it export your files somewhere else. Personally, I just let the stuff export into my skyrim data folder and move it manually to my mods folder when I'm done working with it. building morphs does more than just generate a .tri file. It also links the .tri file to the nif. It would be best to solve this issue that you're having building the morphs, instead of trying to overlook it or work around it.

I looked up the error and saw that it might be related to improper installation of BS/OS through mod organizer. If you're using mod organizer to run it, make sure you installed it properly and running it through mod organizer. I don't personally run mine through MO though, so I can't offer more advice with that.

In the files you sent, I don't see any .tri file. If this is what you're installing to your game then it won't work properly. Make sure to tick the "build morphs" box when you're building your outfit so that it will generate a .tri file.