Update Windows build instruction for 14393 SDK

docs/windows_build_instructions.md

Index: docs/windows_build_instructions.md
diff --git a/docs/windows_build_instructions.md b/docs/windows_build_instructions.md
index f13f63d1c60b96c234a0de99a50a0d64a973ad0f..7f1bf87583b571ae3060019893fa4926f83680e0 100644
--- a/docs/windows_build_instructions.md
+++ b/docs/windows_build_instructions.md
@@ -34,12 +34,14 @@ and select:
 - Universal Windows Apps Development Tools > Tools (1.4.1) and Windows 10 SDK
   (10.0.14393)
 
-You must have the 14393 SDK installed or else you will hit compile errors such
-as undefined or redefined macros.
-
-Install the Windows SDK 10, and choose Debugging Tools For Windows when you
-install this in order to get windbg and cdb. The latter is required for the
-build to succeed as some tests use it for symbolizing crash dumps.
+You must have the 14393 Windows SDK installed - the 15063 SDK has errors and
+cannot be used to compile Chrome. It is okay to have multiple SDK versions
+installed as long as 14393 is one of them. The installer can be found in the
+[Windows SDK archive](https://developer.microsoft.com/en-us/windows/downloads/sdk-archive).
+
+When installing the 14393 Windows SDK choose Debugging Tools For Windows in
+order to get windbg and cdb. The latter is required for the build to succeed as
+some tests use it for symbolizing crash dumps.
 
 ## Install `depot_tools`