The only way to move the application to a new computer is by using the manual method which involves using a USB flash driver or network and some registry exporting.
Firstly, backup the data from PostMate, then copy it to a USB drive. Locate the installation directory as well and copy it to the same drive.
Secondly, go to Start > Run > regedit and expand the
HKEY_LOCAL_MACHINE > Software then locate the PostMate. Right click the folder and choose EXPORT. Specify a name for the *.reg file and select the USB as location.
And finally, copy the installation directory on the new PC in the same location, double click the REG file, and then you can run the application.