Thanks for your answer, 

I just bought BlueSoleil 5.4.286.0 ... and YOU propose a FREE upgrade automatically
and systematically at each start.
The Menu About  send you automaticall to the last versions only.
So it is tricky :
- there is no archives of updates for the various versions ... is there any upgrade for version 5? to 6 etc...
- major version nr (5, 6 or 8) do not appear in the Window Title ... so when you just bought it...
- there was no warning of a trial version, nor why at installation : it warns you when starting it.

So i was fooled into an installation - uninstall - reinstall. 
But the product works fine and i'm happy with what i bought.
 

Hi, I think you have some misunderstanding for our upgrade policy. Our upgrade policy is as follows:

The prior versions such like BlueSoleil 1.x/2.x/3.x had not been maintained. We don’t provide any technical support for years, hope you can understand.

BlueSoleil 6 users have FREE access to the latest version: If you bought a serial number or a dongle from our website at the outset, now you can have free access to the latest version, you just need to do is simply download and install the software accordingly, activate it with your SN or dongle;

End users who purchased Serial Number of BlueSoleil 8 will automatically become BlueSoleil Club member, are eligible for free upgrade of BlueSoleil 8.x series PERMANENTLY. Thank you!