Hi Hardik Bhatt,
We can get a Internet Explorer 9 Installer here.We may need to install the add-ons to open the link for the first time.
Microsoft Update Catalog
https://catalog.update.microsoft.com/v7/site/Search.aspx?q=Internet%20explorer%209
Apart from the link S.Sengupta posted to uninstall the Internet Explorer 11.We also can refer to the following link to uninstall the Internet Explorer 11.
Command line options available to uninstall Internet Explorer
http://blogs.msdn.com/b/askie/archive/2014/03/28/command-line-options-available-to-uninstall-internet-explorer.aspx
Please restart the machine to make it take effect before we tried to install the Internet Explorer 9 .If we come across any errors during the installing process ,please check the IE9_main.log to have a troubleshoot .(C:\Windows )
Best regards
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