where can I find workflow manager developer kit download?

[YinghongLi]

Hello,

I need to have ArcGIS workflow manager 10.4.1 developer kit installation file.  I searched the download page and did not find it.  I downloaded it before from ESRI site.

Thanks in advance.

[YinghongLi]

It is installed with workflow manager and it is not a separate package.  i was confused.  thanks.....