Well... Here is what I did if anyone is interested...

I stored the location of SSIS Packages at Runtime in some database table and used an Expression to change the value of the File Connection used in the Execute Package task.

I would have liked to get the master package current location on the fly, hence avoiding one more configuration data, but it's not a big deal.

Having said that, if you know how to do that, I am still interested! 😀

Cheers

Eric