Tally 9 to Tally 7.2

Due to change of version you can not go back.

it may happen by taking help of tally officials. Contact them may they will help you

if you have the cd please uninstall the version you don't need usually its available in the start-> Settings-> control panel->Add or Remove Programs, you can remove the software and reboot the system you should see the old version still available.<br>

usually version name is specified nest to the application name.  Uninstall the version which you do not need if it doesnot show the old version then you will have to reinstall with the help of a cd.