Here's the main M&T 2.50 files and here's the 2.50.03 patch.
If you already have M&T 2.50 full (or patch 1 or 2), you'll only have to move the MEIOUandTaxes1 folder from the patch download into your documents/paradox/eu4/mod, so it replaces a bunch of the stuff in there. If you're on mac, you'll have to hold the "option" key and click "merge".
Otherwise, you'll have to put the MEIOUandTaxes1 folder and the MEIOUandTaxes1.mod file from the main download into your documents/paradox/eu4/mod first.
Have fun!