If I manually set PS_SHOP_ENABLE to 0 it makes no difference.
I in maintenance tab I click add my ip address (it basically ads my PC ip address), when clicking the 1-click upgrade module I get the error:
(1/1) OutOfMemoryException
Error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 8192 bytes)
in ConfigurationTest.php line 248
I am using the maximum amount of memory in PHP selector options: 512M
Do you think updating needs more memory?
If I use previous versions of the 1-click upgrade module the maintenance check is green (ok).