Hope somebody can help me with this still open issue I have
I have the same problem if I e-mail an XLA Add-In file  to someone (and
of course I can't control where they put it [the default add-in
directory is different for instance due to 'account name' in the path).
An XLS that uses this XLA Add-In can not find the functions from the
XLA Add-In file; it looks that the path is hardcoded in the XLS file...

Or is there another way in distributing XLA files  and XLS files that
use the XLA Add-In?

ANY (really ANY) help is very welcome.