During installation Winfluid says “can’t modify Windows registry” ?

You must start your Windows session with administrator rights.

Then you have to right click on Winfluid icon, then “run as administrator”, after that Winfluid will propose to enter the serial number and licence key.

When done, click on “Ok”. Close all of other windows.

Winfluid will run properly after that.

You can now run Winfluid without administator rights