Error Upgrading to HalionSonic 1.5

I upgraded my HalionSonic content ok but when I tried the .exe, it updated the elicencer and then it stopped with the following popup: The feature you are trying to use is on a CD-ROM or other removable disk that is not available. “Insert HALion Sonic disk and click OK”

I inserted the original HALion disk but that did not fix it. Now I can’t get past this :frowning:

Any clues?