Unfortunately, this time it didn't work!
The weird thing is that in the subsequent reboot I used the ClearNVRAM EFI module of OC, and, then, I got what you can see in the first pic attached. Then, after another reboot, I got what you see in the 2nd pic attached. In the 3rd reboot it passed the verbose initial phase, and I got the graphical interface. But, during the install process, it stopped again with the message of damaged installer... I don't know... but I have the feeling it's an NVRAM issue. But I cannot resolve it!