When install 14.0 on a windows 2019 64 bit you could get error unable to upgrade PATH variable.
This tech doc gives one workaround.
Release : 14.0
Component : CA Harvest Software Change Manager
Most likely the error is due to some permission issue. You can run cmd as an administrator and then
setup.exe /v"/l \"C:\some-existing-folder\install.log\"
Note: even if the permission issue persists, this command will give you more info in the install.log as indicated.