During the testing, we found that Keyman Desktop won't run if the user's Windows computer is running an older version (older than v9) of Internet Explorer. So some Windows 7 users may not be able to use Keyman Mozhi Keyboard.
This is a requirement by Keyman Deskop and there's nothing much can be done for this issue.
One possible work around is to see if the current Keyboard can be compiled for Keyman Deskop 8.
beniza
commented
4 years ago 
During the testing, we found that Keyman Desktop won't run if the user's Windows computer is running an older version (older than v9) of Internet Explorer. So some Windows 7 users may not be able to use Keyman Mozhi Keyboard.
This is a requirement by Keyman Deskop and there's nothing much can be done for this issue.
One possible work around is to see if the current Keyboard can be compiled for Keyman Deskop 8.