no, mojoportal has always been free and is still free. if you have any of our add on products you would want to upgrade those at the same time, but I don't see any purchase history on your account so I'm guessing you just have mojoportal and not any add on features. even our add ons have free upgrades for those who purchased them

if you have any custom features you coded yourself or any 3rd party features, upgrading mojoPortal could break those features

we have upgrading information here, the i7media guys also have an article the ultimate mojoportal upgrade guide. my guess is you are on an old version of .net and would need godaddy to migrate you to .net 4.5 if you want to stay hosted there

its complicated because there exists .NET 4 and .NET 4.5, you need 4.5 but in one sense 4.5 is still considered 4.0 runtime, so it is not clear what you will get

also once you move your current site to 4.5 hosting it will immediately be broken because there are things in the web.config file for 3.5 which are not compatible, explained in the 10th item on our faq

I'm not going to be able to help you step by step, I highly encourage you to get help from someone experienced, I'm not available myself and the only ones I know that I can recommend with confidence to be able to solve each problem as it comes up in your upgrade is the i7media guys