Hi Tarun,
I have a strange problem while installing add-ins on my laptop (client), which has QTP version Build 513. However I did installed same add-ins on the QTP license server without any problems (which also has the same QTP version). Don't know what was causing it. Please take a look at the screenshot that I was attached to this post.

Installer started and while copying new files, it's throwing the following message "Please insert the disk" but there is a disk already in the drive. I never see this message window while installing on the QTP license server. Contacted HP but no resolution so far.

Thanks in advance.