Index: appveyor.yml
===================================================================
diff -u -N -rebaa3d49a8538012e748469b23d1d7242b41f718 -rb2825a791fcf6bf6fc64c7a88cc5025b0273ad61
--- appveyor.yml	(.../appveyor.yml)	(revision ebaa3d49a8538012e748469b23d1d7242b41f718)
+++ appveyor.yml	(.../appveyor.yml)	(revision b2825a791fcf6bf6fc64c7a88cc5025b0273ad61)
@@ -36,7 +36,8 @@
   fast_finish: true
 
 install:
-  - cmd: appveyor-tools\secure-file -decrypt deploy_key.appveyor.enc -out deploy_key -secret %my_secret%
+  - ps: iex ((New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/appveyor/secure-file/master/install.ps1'))
+  - appveyor-tools\secure-file -decrypt deploy_key.appveyor.enc -out deploy_key -secret %my_secret%
   # - if not exist "%MINGW_ARCHIVE%" appveyor DownloadFile "%MINGW_URL%" -FileName "%MINGW_ARCHIVE%"
   # - 7z x -y "%MINGW_ARCHIVE%" > nul
   - if not exist "%TCLKIT%" appveyor DownloadFile "%TCLKIT_URL%" -FileName "%TCLKIT%"