Hi,
both package Manager and asset store version are supported, but you need to switch it accordingly to your unity version ( I haven't found yet a good way to solve this sorry...)
you need to upgrade your cinemachine package and use the one from the Package Manager, not the one from the Asset store ( which is not up to date for the newer versions of Unity)
else, can you tell me which version of Cinemachine you have?
Bye,
Jean