I paid for and downloaded the upgrade from my Logos 3 Gold to Logos 4 Platinum. Intallation has finally completed and everything is now working in Logos 4.
However, my understanding is that I should be able to continue using Logos 3. I can open the program ok, but I can not find any way to get the Platimum resources into Logos 3. I clicked on the upgrade and download icon that installed the licenses in Logos 3, but it does not offer to download any new resources.