All this is telling you is that the solution pack is using a prior version of SS in relation to the one you have installed. It will work just the same as always and no action on your part is needed.
However if you do wish to upgrade the version of SS used just double click on the behaviour and then click OK. This will update the code and (probably) create new files that you'll need to upload to the server (most likely in the webassist folder).
Personally, I wouldn't bother but it's up to you.