Add URLs to download MSVCRT MSU files

nsist/pyapp_msvcrt.nsi

@@ -11,19 +11,23 @@ Section "-msvcrt"
 
   ${If} ${RunningX64}
     ${If} $R0 == "8.1"
-      StrCpy $0 "8.1 x64 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x64/Windows8.1-KB2999226-x64.msu"
     ${ElseIf} $R0 == "8"
-      StrCpy $0 "8 x64 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x64/Windows8-RT-KB2999226-x64.msu"
     ${ElseIf} $R0 == "7"
-      StrCpy $0 "7 x64 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x64/Windows6.1-KB2999226-x64.msu"
+    ${ElseIf} $R0 == "Vista"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x64/Windows6-KB2999226-x64.msu"
     ${EndIf}
   ${Else}
     ${If} $R0 == "8.1"
-      StrCpy $0 "8.1 x32 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x86/Windows8.1-KB2999226-x86.msu"
     ${ElseIf} $R0 == "8"
-      StrCpy $0 "8 x32 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x86/Windows8-RT-KB2999226-x86.msu"
     ${ElseIf} $R0 == "7"
-      StrCpy $0 "7 x32 URL"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x86/Windows6.1-KB2999226-x86.msu"
+    ${ElseIf} $R0 == "Vista"
+      StrCpy $0 "https://github.com/takluyver/pynsist/raw/msvcrt-2015-msus/x86/Windows6-KB2999226-x86.msu"
     ${EndIf}
   ${EndIf}