I’m having issues installing Cinemachine to my project. Whenever I try to install it from the package manager a list of errors are thrown (see image).
Steps to reproduce:
Open a new URP project using Unity version: 2021.2.19f1
Install Cinemachine via package manager (v2.8.4)
There was a package manager failure for an hour or so yesterday. My guess is that what you’re seeing here is a result of that. Please try again and let us know if it has been resolved on your end.
Hi I’ve restarted Unity and tried to install Cinemachine again but I’m now getting these errors instead, weirdly.
You could try this. Make a backup of your project. Remove cinemachine package. Close unity and delete the Library folder. reopen the project. Reimport cinemachine. Let us know if this works 
Is it possible that you have a local copy of some old version of Cinemachine in your project’s Assets? If so, delete it and try again to install from package manager.
If you still have problems, try creating a new empty project and installing Cinemachine, just to prove that the install infrastructure is working.
Hi, so I created a new project using the 3D (URP) template - Editor Version: 2021.2.19f1, installed Cinemachine and still a list of errors are thrown.
Also, I’ve checked the project for potential old versions of Cinemachine in the project and there are none. This is super strange.
Maybe your local package cache somehow got corrupted.
Find it and delete it.
Mine is here:
C:\Users\gregoryl\AppData\Local\Unity\cache\packages\packages.unity.com\com.unity.cinemachine@2.8.4
I found another file that was similar to the one you mentioned and deleted that, now it works! Thanks, Gregory, you are a wizard. Have a great weekend 
