Redirect the definitions to alternate location?

I would like Avast to be installed on drive C: but the definitions downloaded / stored to a different drive. Can this be configured, or manually changed?
Why- I’m using Faronics DeepFreeze, which doesn’t allow any changes to drive C, therefore all changes are lost on reboot.

Updating Anti-Virus With Deep Freeze http://www.faronics.com/en-uk/document-library/document/updating-anti-virus-with-deep-freeze/

video https://www.youtube.com/watch?v=phDEOEGvU9A