If you are migrating to a new production server, most likely, before making a full transition, you will want to do some testisng. In that case, you will run the solutions simultaneously on both servers - current and the new one.
current and new production servers working simultaneously? And so you cannot deactivate the license on the old server? If that's the case, just use SSIS PowerPack Trial on the new production server. When you are done with testing, uninstall the Trial, and then install SSIS PowerPack from Customer Download Area: