Struggles installing Marketpress

I subscribed wanting to upgrade from MarketPress Lite to MarketPress Pro, but opening the zip file through my browser started a continual loop opening tabs, so It couldn’t be installed. Also, I went to look for support but the website form never accepted my message…just kept saying “please wait.” I could not find support anywhere else for my issue without spending a lot of time hunting. I found no manual, no instructions, no support. Within my plugins it says that MarketPlace is installed, but all I have access to is the lite version. How do I install/access the pro version?