We can install QTP Tool on Virtual machine.
The maintenance number is needed to install.
To get the maintenance number follow the below steps.
Pre Condition : Your QTP License is need to be expired.
1.Launch the QTP Tool.
2.Your are able to see the License Error.
3.Click on "Install License" button.
4.Select your license type as Seat and say Yes on the pop up
5.Now you are able to see Maintenance number on this window
"QTP License Installation - Welcome"