Parallels finds the ISO-FIle and starts to boot. The input screen asks me for licence -key. The licence key entry is successfully. After some while the installation breaks off with the message: No operating system is installed in this virtual machine. I am running Mac OS 10.13.6 with Parallels Desktop V15.1.5 I have about 10 guest systems installed. 5 of the are Win 10. Does anyone have any idea ? Thx, Manfred
