Fatal Error- ProSites and MarketPress

After minimal convincing from your support team, I decided to try out Market Press and Pro Sites for my e-commerce and subscription solutions. However, after installing and deleting the FTP files multiple times on a my multisite and on a single install of WP, I keep getting fatal errors for both of those plugins. I was so hoping to streamline my whole WP experience with just your company, but now can't get anything to work!

Any suggestions would be greatly appreciated!

Thanks!