Is there a command or other way to determine the version of Credential Manager in my git installation?
From Git-Credential-Manager
's GitHub documentation
Assuming the GCM has been installed, using your favorite Windows console (Command Prompt, PowerShell, ConEmu, etc.), use the following command to interact directly with the GCM.
git credential-manager [<command> [<args>]]
So to display the current version you can use
git credential-manager version
If you are using a newer git for Windows version that includes credential-manager-core the command is:
git credential-manager-core --version