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Hi Steve, did you get this sorted out in the end? I was having the same issue but I am running v2.4.25 and I found this post when I was trying to find a fix.
One day, the machine thumbprint just kept changing every time my laptop is restarted. Could not figure out the issue until I remembered that I have disabled the 'VirtualBox Host-Only Ethernet Adapter' (installed and used by PCT) recently. Once I enabled this, the machine thumbprint stops changing. And it seems to have reverted back to the previous thumbprint and the licenses activated previously work again.