The license file is attached to mail of a title called "Dxtory License File".
Save the file to PC in which Dxtory was installed.
Ex. Thunderbird 
"DxtoryLicenseFile.dxtorylic" is double-clicked or a License Register is performed.

The full path of a license file is inputted into a License Register.

It will be completion if it clicks "Register".
Saved "DxtoryLicenseFile.dxtorylic" can be deleted.