To add: 1:) Registration later worked fine.
2:) The small initial downloader (400K) from TotalD puts the TotalD installer to “Username”/AppData/local/Temp folder with namefile (in some subdir) “TotalD-Installer.exe” and size 3499KB – 3,41 MB (3.582.040 byte) in my occasion (win10 32bit). After the TotalD-Installer.exe finishes installation it removes itsself from “Username”/AppData/local/Temp folder.
I use as Firewall the native win 10 firewall and as Antivirus the native Windows Defender.
Also i got the impression that the program neeeds .NET libraries. Those .NET libraries are default installed in Win10 OS.