Sierra or High Sierra - can my laptop support it?

Hi all two computers, macbook and mac pro, specs are below. I am having difficulty accessing browsers as web technology improves.

Most don't work or I am greeted with the dreaded security certificate out of date. Both computers work great.

Can I upgrade to Sierra or High Sierra? I know technically neither of these machines is supported. The short answer and official answer is NO. But what would happen if I tried to install? Would new OS just be rejected? Would it overheat the...

Sierra or High Sierra - can my laptop support it?

via Canadian Mac Forums at ehMac https://ift.tt/XTsjiUk