HALion Sonic update to 1.6 problem [SOLVED]

I have up and running smoothly HALion Sonic 1.5 (win 7 / 64) and tried to update to 1.6, but I got the error code 1603.

I inserted my original HS disk, but still got the same error.

Then I remembered that my original HS disks are upgrades from Hypersonic2. Actually, I installed first HS SE with CB6 and then upgraded to full HS 1.5 from Hypersonic2.

Does this cause the problem? Is there’s anything else I can do?

Thanks for any suggestion

Format / Re-install everything / Big fuss / No problem