The base package release does not exist

[ghost]

• 6.3.1:

• Squirrel.Windows:

When running build the first time everything completes fine, but after updating the the app package.json version (in this case, from 0.1.2 to 0.1.3), Any subsequent builds fail with the following error message:

Error: Command failed: C:\Users\username\.cache\Squirrel.Windows\Squirrel.Windows-1.4.4\Update.com --releasify C:\Users\username\git\appname-app\dist\win\appname-0.1.3-full.nupkg --releaseDir C:\Users\username\git\appname-app\dist\win 2016-08-31 14:22:53> Unhandled exception: System.IO.FileNotFoundException: The base package release does not exist
File name: 'C:\Users\username\git\appname-app\dist\win\appname-0.1.2-full.nupkg'
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
System.IO.FileNotFoundException: The base package release does not exist
File name: 'C:\Users\username\git\appname-app\dist\win\appname-0.1.2-full.nupkg'
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.Update.Program.Main(String[] args)

2016-08-31 14:22:53> Program: Starting Squirrel Updater: --releasify C:\Users\username\git\appname-app\dist\win\appname-0.1.3-full.nupkg --releaseDir C:\Users\username\git\appname-app\dist\win

2016-08-31 14:22:53> Unhandled exception: System.IO.FileNotFoundException: The base package release does not exist
File name: 'C:\Users\username\git\appname-app\dist\win\appname-0.1.2-full.nupkg'
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
System.IO.FileNotFoundException: The base package release does not exist
File name: 'C:\Users\username\git\appname-app\dist\win\appname-0.1.2-full.nupkg'
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.Update.Program.Main(String[] args)

   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.Update.Program.Main(String[] args)
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFile)
   at Squirrel.Update.Program.ReleasifyElectron(String package, String targetDir, String baseUrl)
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)
   at Squirrel.Update.Program.Main(String[] args)
    at C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\util\util.ts:96:16
    at ChildProcess.exithandler (child_process.js:213:5)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:852:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:215:5)
From previous event:
    at Object.exec (C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\util\util.ts:77:9)
    at C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\targets\squirrelPack.ts:183:26
    at next (native)
From previous event:
    at tsAwaiter (C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\util\awaiter.ts:10:47)
    at Object.build (C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\builder.ts:195:52)
    at Object.<anonymous> (C:\Users\username\AppData\Roaming\npm\node_modules\electron-builder\src\build-cli.ts:27:28)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.runMain (module.js:590:10)
    at run (bootstrap_node.js:394:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:509:3

It appears that Squirrel.Windows expects appname-0.1.2-full.nupkg to be present to create deltas but electron-builder has already deleted it (and replaced it with appname-0.1.3-full.nupkg) by the time this command is run.