Try moving to install

Former-commit-id: 074e73ec451c7b43427805e84718d6ae472eb7b2
Former-commit-id: 7af4cc2024c24f2e1e29e5143da844412f97bc72
Former-commit-id: b431cdde031095591e50151310905ff3d5481e6c

appveyor.yml

@@ -1,10 +1,14 @@
 version: v1.0.0.{build}
 os: Visual Studio 2015
 
-init:
+install:
+# Use the install script to grab the latest dotnet install
 - ps: iex .\dotnet-latest.ps1
-- cmd: >-
-    set PATH=C:\Program Files\dotnet\bin;%PATH%
+
+# Prepend newly installed Python to the PATH of this build (this cannot be
+  # done from inside the powershell script as it would require to restart
+  # the parent CMD process).
+- "SET PATH=C:\\Program Files\\dotnet\\bin;%PATH%"
 
 assembly_info:
   patch: true