Updated to support XenForo 1.2.3 (untested on 1.2-1.2.2)
Reworked register form modification to use the template modification system in XF 1.2
Simply upload all files in the upload folder and update the addon with the included XML file.
If you edited your register form template for a previous version of Mandatory Location, you'll want to either:
a) Remove it (recommended), or
b) Keep it and disable the template modification made by this addon (debug mode might be required)