What is Prestashop doing - Upgrading from 8.0.4 to 8.1.4 major problem ??

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Ok in doing an upgrade, it comes back with an error that the php version needs upgrading from the current php v7.4 to v8.0.30

This is not a real problem.

But the next stage is where it gets tricky.

Under my domain name, I use sub directories for my live shop, and for staging installations and for design installations.

But the error message I get back, is that I cannot upgrade my v 8.0.4 to v8.1.4 as its in a sub directory. I can only install into the domain name main directory.

So I tried to install a new copy of v8.1.4 and the error message I get back is the same, in that I cannot install v8.1.4 into a sub directory, only into the domain name main directory.

Anybody else have the same problem, and is there a work around to install into a sub directory.