Try declaratively doing artifacts.

Author: ejsmith

Libraries/Package.ps1

@@ -96,6 +96,4 @@ ForEach ($p in $client_projects) {
     nuget pack $nuspecFile -OutputDirectory $packageDir -Version $nuget_version -Symbols
 }
 
-Get-ChildItem $packageDir\*.nupkg | % { Push-AppveyorArtifact $_.FullName -FileName $_.Name }
-
 Pop-Location

appveyor.yml

@@ -30,6 +30,9 @@ notifications:
       secure: WxN+iiJf8AT50n50y8/AkTMl+Cvma6lwSdffFaBU6/o=
     room: Notifications
 
+artifacts:
+  - path: Build\Deploy\packages\*.nupkg
+
 deploy:
   - provider: Environment
     name: MyGet