Hi,
Welcome to our community! 
Thanks for letting us know about this problem. Unfortunately, we haven鈥檛 found any solution yet.
I would suggest to download Rick鈥檚 project from GitLab. Here is the link:
Then copy the AssetPacks folder and paste it into your Assets folder. This might take a couple of minutes because Unity will have to import everything.
Please let me know if this worked for you. 
See also:
- Forum User Guides : How to mark a topic as solved