[cflsystems]

I just saw this thread. This is major limitation which basically means start with 5.2.x from scratch which is unacceptable. Not to mention some user have already paid new subscription so they can upgrade to 5.2.,x and now they can't.

So now the main selling point of XC5 over XC4 runs down the drain. And reading all the other threads about all the problems this upgrade has just makes me sad...

When modules and core are downloaded for an upgrade they are downloaded to /var/tmp directory with name like this

/var/tmp/974648368.gz

Now probably somewhere in db there is a cache or similar table with relation what's what but did you try to put your custom module in /var/tmp with some name like that - of course make sure it is gz archive - and see if it works.