As of DotImage 10.6.0.3 and later, we no longer distribute help installers. Instead, the Atalasoft API reference is provided in an ApiReference.chm compiled help file which ships with the SDK.
It can be found in
C:\Program Files (x86)\Atalasoft\DotImage 11.1\Help\ApiReference.chm
(replace DotImage 11.1 with the version you have installed)
You can also find our latest API references and developers guides online here:
Q10052 - INFO: Why do the help files not show up in Visual Studio .NET?