Activation issue osx 10.5.8

HI there

I am trying to install Draftsight on an iMac 2.66GHz intel Core 2 Duo. 4 GB Ram, OSX 10.5.8

I have tried downloading the latest version of draftsight but this requires OSX 10.6.?

 

I am trying to install an older version of draftsight that will run on 10.5.8

After installing, sending activation email, receiving activation email, getting a website that said activation successful

Open Draftsight. "This product is not licenced or has expired"

Any help would be greatly appreciated!

Thanks

 

Daniel