How to update Catch Box Pro 2.9.3 to 4.95

Well our multisite has not had this theme updated for some time. I heard from a new admin that their site was using CBP 2.9.3. I downloaded the latest version (4.9.5) but cannot find a way to update the theme since there is not "update now" notice. How do I pull in the files. I tried to add the update as a new theme but it failed citing the folder already exists. Please help as I have two other Catch themes sorely out of date on their versions. Thanks, Daniel