Have you looked at the following: https://marketplace.appthemes.com/child-themes/good-old-classipress-3/ This gives the look and feel of Classipress 3 but uses the framework from 4.
Liked On: February 25th, 2019, 09:56 PM
As version #3 is no longer available I think you may want to consider your options for the future to be honest. Don't think there will be a lot of future support, seeing I cannot download the latest...
Liked On: February 25th, 2019, 09:56 PM