Hi Bill,

Which Pro did you buy (6 months worth, or the 'extended' 12 months worth) and how long ago did you buy Pro?

If your Pro benefits aren't current anymore (eg if you bought 6 months of Pro more than 6 months ago) then you'll have to pay again.
You only have to pay once for the Pro installers that you download while your benefits are current...but you need to save & back up those installers, if you want to keep using them indefinitely