Can't input License Key on standalone computer

When I bought version 1 some 3 years ago, I was able to enter the License once I installed the program on my standalone machine. With v3, however, I’m told I absolutely have to be connected to the internet to enter the License Key. I will not put my secure machine at risk. But this sucks. Is there any way this can be corrected? Or am I to be forever confined to v1?