facepalm.jpg... You tell me what isn't the problem, I've seen this issue for years.
IF you read the problem from the error message it says he needs 5.2.5, and look above he has 5.2.7
Are you just posting without viewing?
Anyways, Simple. Someone could have put this together with a little googling on even viewing RevCMS Add-on's selection.
Your IP can be dynamic, which mean it changes, go star start>Run> type cmd in the box> then type ipconfig.
Make shure the IP ADDRESS is the same as the one you used to portforward.