4.15 had normal 80Mb API.chm file in Documentation folder. Now I use 4.16 and here is 163 Kb invalid API.chm file. . . Where can I get valid 4.16 API.chm ?

There have been a few issues with the tool that generates our API documentation, but it’s being worked on as we speak. Most issues have been resolved, and we hope to have the 4.16 API.chm and HTML API documentation up soon.