>>336121323
That really doesn't sound like a VRCSDK issue, but you'd have to show me a screenshot of what you mean when you say your right arm isn't appearing. My speculation is that parts of the avatar weren't imported and are therefore missing, this is especially likely if it was a unity kitbash. My best advice for you, should you try again, is to backup your unity project and then delete the SDK2 files, pic related, and import the SDK3 from the website and try following the tutorials starting from there.