Well, the Soft-eLicenser is bound to your hardware and it takes the serial number of your harddrive into account as well as the graphics card.
But just changing the graphics card should not render the license unusable. Did you already earlier change other parts of the hardware?
No other changes made and I’m starting up using the same SSD. The only other change I made was to upgrade to High Sierra yesterday but Dorico was working today before I changed the GPU.
I tried to reactivate on the website but it says no eLicenser to activate although I did go through the process of updating that information, several times.
I have urgent projects so am quite anxious. I submitted a support ticket but realise that could take a while to get a response.
If you haven’t yet done so, I strongly recommend that you register your Soft-eLicenser to your MySteinberg account. Go to MySteinberg, and click the ‘Register Software’ button, then enter your Soft-eLicenser number as shown in eLicenser Control Center. Then in the future if you need to reactivate, the reactivation workflow (described here) will work as expected.