I've uninstalled DCS World, A-10C, BS2 (upgrade version) and P-15.

I downloaded and installed DCS-World 1.2.2.7122
I downloaded and installed DCS-P-52 1.2.2.7122_19
I downloaded and tried to install DCS-A-10C 1.2.2.7122_19 and I get the message DCS World 1.2.2.7122 must be installed
I downloaded and tried to install DCS-BS2 (upgrade version) 1.2.2.7122_23 and I get the message DCS World 1.2.2.7122 must be installed

In other words - BS2 Upgrade and A-10C won't install :-(

Nevermind - it seems it doesn't want to install into a different folder to DCS-World...BUT once I tried to install it into it's own folder (BS2 and A-10C) and I got the error, I changed the directory to the DCS World folder it was wanting to install into previously - and it still came up with the error - hence why I posted.

But a fresh retry to install and NOT changing the expected DCS World folder and it installed fine