Membership Pro, how to activate

Hi There, I've downloaded Membership Pro to test out on updating a development site prior to unleashing it on the live site. I was just wondering, as I appear to have passed my sites limit for auto upgrades, whether it's OK to just upload the new version. I'm a bit worried it will lose all of the subscription data so I wanted to check the best way to do this.

Also, how many sites am I allowed to have with my current membership leve? I'm not sure what colour I am and it doesnt seem to mention it anywhere.

Thanks

Ben