altmemphy ip license problem

I need to modify an old project, developed with Quartus II 9.0 on a Stratix III, that contains a DDR2 controlled made using an altmemphy IP. So I installed the software, made the modifications and recomplied it. Unfortunately it is not more possible to generate a working programming file, because with the current Quartus II license file (dated august 2015), the license to compile this IP is not more present. Only a time-limited programming file is generated. So I have the right software, I have a working license, but I cannot use an IP whose license was previously included into the base software. Why?

I configured the license server with the old (expired) license file, and it was possible to compile and generate the programming file, but this cannot be a solution because we have floating licenses running on a server, that is used by many designers.

I tried to run multiple services from the flexlm tool, connected to different IP ports. In this way I could connect to an alternate server port only when I am working on this old project. It works, but after some time, the altera license daemon stops with an error, because it detects another daemon running. I can understand why: if this would be possible, I could easily multiply my licenses, and this is not allowed.

I cannot force the whole company to use an old license (having puchased a new one) file only because I need it... so my question is: is there a "legal" way to do this?

regards

Davide