Windows 10 x64 Pro version 1903 and the beta tools works 100% now.
Here is the summary of what I did (as mentioned in this discussion)
1-) Install beta tools 8.2.1
2-) When it fails at the end don't worry just reboot.
3-) As ruskofd suggests: --> Launch the following command in the C:\Program Files\XCP-ng\XenTools folder with an Administrative prompt : InstallAgent.exe DEFAULT
4-) Install beta tools 8.2.1 again with REPAIR.
5-) Accept driver confirmation
7-) Now in my case two drivers XN0002 XENBUS VBD and XN0002 XENBUS VIF were not installed, so I used borzel's suggestion: --> you have to install the drivers then manually ... point the driver install dialog from windows to c:\programe files\xcp-ng\drivers (don't forget to tell him to search also in subfolders)
9-) Check all the drivers are working. In my case VIF was not installed so one more time install driver manually
Thank you all for suggestions.