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Installation issues

Installation Fails with a 1603 error (MSI log)
This occurs when the UninstallOldVersions custom action is allowed to run on a system that has had a previous client installed, and the action finds remnants of that old client. This is fixed in desktop app version 6.2.x.269 and later. 
There are two levels of functionality, one is always disabled, the other you need to edit the 
options.xml
 schema and set DeepCleaning to NO. You should always set DeepCleaning to NO to completely remove the UninstallOldVersions custom action from the MSI.