Market Press vs Simple Market?


I have Spirit with Simple Market for my shopping site. I just can’t get the buy now buttons to work properly. They work from the “Store” page but nothing deeper. (Example: store/products/Journey)

Would Installing MarketPress work better?

Would I have to completely re-do my site?

Would it be possible to either get phone support or hire technical support to get help setting up my shopping site?

Thank you,