Lightroom 6 standalone upgrade does not install - does not validate the serial number

Hi,
I have bought (Adobe store) yesterday and downloaded Lightroom 6 standalone upgrade (I own lightroom 4).
During the installation in Windows PC I get the following message: "We are unable to validate this serial number for Adobe Lightroom. Please contact the support"
- the Internetconnection is fine
- checked etc/host
- double checked both serial numbers
It is just impossible to install the LR6 upgrade on my Windows PC. There were no problems installing and running LR4...
Any help would be greatly appreciated...
Peter

Please check your hosts file entries once as sometimes due to no connection to the serialization server adobe doesn't verify the activtion.
See the steps here-
Sign in, activation, or connection errors | CS5.5 and later, Acrobat DC
Or
Reset the hosts file:
Note: You may have to disable you security software to modify your hosts file.
Windows
Choose Start > Run, type %systemroot% \system32\drivers\etc, and then press Enter.
Right-click the hosts file and select Open. Select Notepad for the application to open the hosts file.
Back up the hosts file: Choose File > Save As, save the file as hosts.backup, and then click OK.
Search the hosts file for entries that reference activate.adobe.com (for example,127.0.0.1 activate.adobe.com) and delete these entries.
Save and close the file.
Mac OS
Log in as an administrator to edit the hosts file in Mac OS.
In a Finder window, choose Go > Go To Folder.
Type /etc.
Select the hosts file and open it.
Back up the hosts file: Choose File > Save As, save the file as hosts.backup, and then click OK.
Search the hosts file for entries that reference activate.adobe.com (for example,127.0.0.1 activate.adobe.com) and delete these entries.
Save and close the file.

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