I've recently upgraded from Unity 2019.1.5f1 with Vuforia 8.1.7 to 2019.2.0f1 and Vuforia 8.3.8, and I now can't get Vuforia to work at all. My AR projects were working fine before, but I now I can't even import the Vuforia package into Unity. I have activated it on the Android Player Settings window, but when I try to add an AR camera it asks to download extra assets just like before, I press OK, and it downloads for a short while before failing and giving me a long list of errors. I've attached a screenshot of the Console log with what I think is one of the main culprits highlighted, but I don't know how to go about fixing it.
I'm not sure if this is looking in the right direction, but I found this blog post in fixing GUID (if that's even the problem) - https://blog.doppioslash.com/mildly-painful-solution-to-unity3ds-meta-guid-hell/ - If this is the right way to go, which folders / files do I need to delete?
Can anyone give me any advice? I'm pretty new to Unity and doing this for a work project, so simple instructions would be much appreciated!