Totally understand that this is a long shot. I’m on vacation right now and wanted to spend some time with Dorico 4 because I thought it would be really fun! Bought the upgrade but then realized that I don’t think I can activate the software without my eLicenser which is at home. I have proof of purchase of previous versions of the software. Completely understand if there isn’t a way around this - in that case, I’ll patiently wait until I’m home at the end of next week!
You should be able to download the free trial version which will last until you can sort it out.