JDBC for VisualFox Pro Driver

My companies ERP database is an ancient VisualFox Pro database and it doesn't play well with JDBC. I have seen some posts on here from Cas about some third party drivers. I downloaded the trials and they worked for about 30 seconds. The errors said I had reached my polling limit so I couldn't even test them out in my project. There seem to be 3, one of them you cant even buy anymore.

Does anyone have a resource for an open source driver or any other ideas? I'd hate to buy a production license just to find out it doesn't work that well.