Upgrade Client from 4.x to 5.0

We just finished with the Avamar 5.0 upgrade from 4.1 and now would like to update the clients.

All clients are running Windows 2003 R2 server and  have the 4.1 client installed.  Do I just run the 5.0 client install or  do I need to uninstall the 4.1 client then install the 5.0?

I would like to keep the logs files along with any historical data from the backups that have occured.