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I have recent gotten
 WARN: ucrtbased contains known issues. Please update Visual Studio or the Windows SDK.
 See: http://bugs.python.org/issue26624
F:\Python\dev36円\PCbuild\python.vcxproj(91,5): warning MSB3073: The command ""F:\Python\dev36円\PCBuild\win32\python_d.exe" "F:\Python\dev36円\PC\validate_ucrtbase.py" ucrtbased" exited with code 1.
but Python still ran for me. Today, I recompiled, and python stopped running when I try to either run IDLE or patchcheck. To eliminate the old .dll as a cause, I tried to 'update'. How to do so?
I started VS by double clicking pcbuild/python.vcxproj. The first barrier was that Community 2015 is only good for 30 days (the compiler invoked by build.bat still ran) and I could not access the menu. Once I got the license renewed, so VS ran, there is no Update entry on Help or anywhere else on the menu that I could find. (I seem to remember that VC Express updated automatically.)
When I started VS2015 from the start menu instead, there was a splash screen with News and a link to a brand new Update 3.
https://blogs.msdn.microsoft.com/visualstudio/2016/06/27/visual-studio-2015-update-3-and-net-core-1-0-available-now/
I clicked the first link and downloaded vs2015.3.exe. ran it, and left the minimal selection of components alone. After 3 GB downloaded and installed, there are error messages that *cannot* be copied and pasted. Here is a summary:
1. VS update prereq: Installer failed. bad hash 0x80091007
(did this mess up everything?)
2. Team J. Serv CTP! SToryboarding Pack file not found 0x80070002
(This does not seem like something I requested.)
3. VC++IDE base resource package ditto as to error.
(Perhaps not needed for build.bat)
Log file attached. I will restart and see what happens.