You shouldn’t loose anything, As per our text, it is totally compatible with latest version of wordpress.
Not according to the download page
“Requires: 3.4 or higher
Compatible up to: 3.8.3
Last Updated: 2014-12-9″
When I uploaded WordPress version 4.1.1 Marketplace disappeared and could not be added. So I went back to my earlier version of website.
However today I cannot access my dashboard because someone else registered as a user and I am in the process of resolving this issue.
Is there someone else who can help with accessing my dashboard or resetting my registration?
I have resolved the hacking issues with the assistance of our server host.
I have updated our wordpress site to version 4.1.1
Reinstalled the Marketplace plugin version 2.4.1 and all seems to working correctly at present.