There were some issues - again not with the simple update itself and not even with the program itself but rather with how MSI works on a Windows computer. In the end we had to make some changes how Host installation works. Now Simple update should work ok when updating Hosts 18.104.22.168 to 22.214.171.124. However, these fixes do not work restrospectively, i.e. if you use Simple update to update your 126.96.36.199 Hosts there may still be issues.
However, even if you use Remote install tool or even manual update you don't have to build a custom installer just for the purpose of updating. Use the vanilla Host installer - in this case it will update the program files and leave your settings intact.
Would really like to see improved update features for customised installs. It gets a little old needing to recreate my MSI/EXE/Agent from scratch every update and then push the files out individually. The application really should be capable of updating itself automatically without losing settings.
You do not have to create another agent/host installer in order to update your installations unless you want to change some Host settings in addition to just updating the program itself.
If this is an older version this looks like antivirus software activity. There is simply no other reason for the program to just get wiped from the computer. Remote Utilities Host doesn't have any self-destruction mechanism (why would it).
This problems occurs when the system cannot get access to %appdata% (where the Agent files are extracted once you click on it). In normal circumstances this folder should be accessible for the current user.
Please, try deleting this folder %appdata%\Remote Utilities Agent\ and then re-run the Agent.