Upgraded to 13, old license is not recognised.

I last bought Parallels back in 2006, I've used VMware Fusion since then. I've now decided to return to Parallels, but the upgrade does not recognise my previous license.

Any help appreciated.

Thanks

 

You can upgrade to Parallels Desktop 13 if you have a Parallels Desktop 11/12 permanent key else we suggest you to get refund and purchase full version.