If the SDcard is removable, all they have to provide is a new image file and you can write it on the SDcard - I don't see why you'd need to get a new SD card.

@ohmycommodore this website needs Facebook like reacts 😂

Hello @mitu

Thank you very much for your hint about KMS in the config.txt file.
I really didn't paid attention to this.
It was really commented, I don't know why. I didn't ever edit this file.
Now the installation has finished successfully.

The solution was really uncomment the two lines below regarding KMS dtoverlay into /boot/config.txt (and restart) :

[pi4] # Enable DRM VC4 V3D driver on top of the dispmanx display stack dtoverlay=vc4-fkms-v3d max_framebuffers=2 [all] dtoverlay=vc4-fkms-v3d start_x=0 gpu_mem=256 hdmi_enable_4kp60=1

Thank's a lot for your help. I hope this topic may help many other friends to enjoy Retropie.

Kind Regards.