Still have old 1.818.210.58-1 install - recently 2.11 Upgrade Tool module appeared?

I’m running 1.818.210.58-1 on a machine that 99% of the time is an internal only network (the machine is quite old and can’t run CentOS 6) and understand that it’s reached it’s end of life. I’ve installed module updates for FreePBX from time to time when it’s on the net. I’ve had no issues doing so. Earlier today however a 2.11 Upgrade Tool appeared in the module section. I know the release is unsupported now, but has anyone used the 2.11 Upgrade Tool with 1.818.210.58-1 or know what will happen if it’s used? Thanks in advance.

I have just used the upgrade tool on a test box and got an error
Reload failed because retrieve_conf encountered an error: 1

Managed to work the issue out ,it was fop2admin module causing the reload failure