Always downloading corrupted iso (CORE)

[zabadabadoo]

@jan_v I replied to your other thread:

Booting straight to Windows after installing Zorin

Have you disabled Secure Boot, Fast Boot in BIOS? See this: Before you install How did you install ZorinOS. Can we assume you selected the "Install alongside" option. If you have your ZorinOS live USB. Use that in "Try Zorin" mode to find and run "Boot Repair". That tool should repair grub for you to choose Zorin or Windows from grub menu.