I need download a ISO of PVE 7.1-7

7.1 ist not supported, there are many bugs and security issues fixed since 7.1.

I highly recommend you upgrade to a current version.

If you REALLY need 7.1 ISO, please contact our enterprise support team (I assume you have a valid subscription?).
 
I'm experiencing a similar problem with my VGA monitor. It doesn't support the resolution of 1280x1024 at 60 Hz. Is there a way to resolve this issue since version 7.1 is no longer available?
 
I changed to a motherboard with integrated graphics, and everything started working smoothly. It seems that older graphics cards are not supported, evidently.
 

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