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did we not read the readme...
if it's not a production site:
while I don't advise it unless you can back up and restore your database, current module files, and custom templates, it is possible.
you can (because I did...)
1. Copy the *contents* of mxdirectory into your existing x-dir directory (replacing all files)
2. follow readme to rename the class file
3. execute the update.sql file data in the sql window of phpmyadmin (you should get a confirmation of created entries)
4. update the module in admin
5. regenerate custom templates (if any)
I don't advise doing this, but there it is and it works if you dont miss a step or fat finger the keys. No warranty