Zorin OS UEFI Shell startup problem

Nice, anyway I have some extra questions with this you show, I'm new to Linux and I'm loaded with a lot of information these last days:

What happens if I install an older 32-bit version of Zorin that is no longer supported, e.g. 32-bit Zorin OS 15.3 Lite?

Is there a way to verify that the ISO has not been modified in this case?

I read in this thread Zorin-OS-15.3-Lite-32-bit.iso that they recommended using Zorin OS 16, which added support for 64-bit systems with 32-bit UEFI. Does this work for me?

And thank you very much for everything, despite having these obstacles is all very interesting, and the truth I do not know many things, but with your comments I'm moving forward.