Try node 7

.appveyor.yml

@@ -8,7 +8,7 @@ build: off
 shallow_clone: true
 platform: x64
 environment:
-  NODEJS_VERSION: "8"
+  NODEJS_VERSION: "7"
   CSC_LINK: '%WINDOWS_CSC_LINK%'
   CSC_KEY_PASSWORD: '%WINDOWS_CSC_KEY_PASSWORD%'
 
@@ -26,7 +26,6 @@ install:
 cache:
   - '%APPDATA%\npm-cache -> package.json'
   - '%USERPROFILE%\.electron -> package.json'
-  - 'node_modules -> package.json'
 
 #---------------------------------#
 #       tests configuration       #