This articles explains what to do when you install a new driver and a message pops up saying another version already exists 

Whenever installing a new Elo driver and a message appears stating an Elo driver already exists, please remove; most likely there are remnants of a previous driver install on the system which did not get removed. 

To correct for this you will need to perform a manual driver removal, please see the below Knowledge Articles:

• Windows 10 Manual Driver Removal Procedure
• Additional Manual Driver Removal for Windows 10
• Manual Elo Driver Removal Tips for Stubborn Uninstalls