Thank you for contacting us on this.
I kindly ask you to check if The Welkin Suite IDE is present in the following directory: $user/Applications/.
Also, after the first launch, you can find the application using the 'Command + Space' hotkey and it appears in your Launchpad.
We install TWS to the user's 'Application' folder since if the IDE would be installed in the system folder instead of a user's one, there could be issues related to automatical updating the application since not all users could have the appropriate privileges.
Also, The Welkin Suite IDE is related to a user's license, this is why, in a frame of a user's security, it is installed to a user's 'Application' directory.
Hope this helps. In another case, please let me know.