Hi Greg,
Thanks for your interests in Syncfusion products.
When you run our syncfusionessentialstudiohelpsetup.exe file, by default the locally installed documentation will install under the following folder.
[System_Folder]{C:}\Program Files\Syncfusion\Essential Studio\Documentation\64
After the complete installation of the help setup file you will find the chm format of the WPF controls under the following folder.
System_Folder]{C:}\Program Files\Syncfusion\Essential Studio\Documentation\64\Help\Essential Studio WPF.chm
We regret for this inconvenience caused. Could you please try now with the Class Reference link for the online documentation. As we are now able to access it.
http://www2.syncfusion.com/cr_64/-4-1-index.aspxPlease let us know if we are missing anything.
Regards,
Bala.