Today I downloaded the latest version of the software (18.104.22.168) and tried to install it. It instantly fails after the download piece. I decided to uninstall the previous version and then it worked.
Posted 14 Sep 2017
Thank you for your post.
We have been faced with this issue, and our developers will work on displaying the correct message in the case when there is already installed The Welkin Suite IDE.
This will be fixed in one of the nearest version of the IDE.
Also, we are going to add an ability for manually updating the application directly from the IDE in addition to TWS auto-updating functionality.
The Welkin Suite