Cannot download differentially: __installer.exe missing

• 20.28.4:

• 3.1.2

• Windows - NSIS

Hi, I’m attempting to use electron-updater for the first time (previously used Squirrel for windows) but I am getting an error in the logs when it is attempting to “download differentially”. I am using an S3 bucket. The error is:

[2018-10-04 16:09:24.332] [error] Cannot download differentially, fallback to full download: Error: ENOENT: no such file or directory, open 'C:\Users\James\AppData\Roaming\my-app\__installer.exe'
    at C:\Users\James\AppData\Local\Programs\my-app\resources\app.asar\node_modules\electron-updater\src\differentialDownloader\DifferentialDownloader.ts:119:29
    at Generator.next (<anonymous>)
From previous event:
    at GenericDifferentialDownloader.doDownloadFile (C:\Users\James\AppData\Local\Programs\my-app\resources\app.asar\node_modules\electron-updater\src\differentialDownloader\DifferentialDownloader.ts:118:82)
    at GenericDifferentialDownloader.downloadFile (C:\Users\James\AppData\Local\Programs\my-app\resources\app.asar\node_modules\electron-updater\src\differentialDownloader\DifferentialDownloader.ts:92:17)
    at GenericDifferentialDownloader.doDownload (C:\Users\James\AppData\Local\Programs\my-app\resources\app.asar\node_modules\electron-updater\src\differentialDownloader\DifferentialDownloader.ts:79:17)
    at C:\Users\James\AppData\Local\Programs\my-app\resources\app.asar\node_modules\electron-updater\src\differentialDownloader\GenericDifferentialDownloader.ts:6:16
    at Generator.next (<anonymous>)

It appears to be looking for the latest installer as __installer.exe which does not exist in my AppData\Roaming\my-app\ folder… but there is a MyApp Setup 0.0.5.exe in the AppData\Roaming\my-app\__update__\ directory… perhaps it should be looking there instead?

It does successfully download the full version for update, but obviously the delta update would be better.

Thanks for advice.

[bennettatoms]

Hi there!

First of all, thank you for all your work on electron-builder (it’s remarkable!), and for being so responsive to the issues raised. We’re using electron-builder v20.34.0 and just got the same error trying to auto-update for the first time on a windows machine. Mac auto-updating seems to be working fine, but on the windows box we got:

[error] Cannot download differentially, fallback to full download: Error: ENOENT: no such file or directory, open ‘C:\Users\ThisGuy\AppData\Local\OurElectronApp\installer.exe’

The only directory I see inside 'C:\Users\ThisGuy\AppData\Local\OurElectronApp' is pending.

Any advice? @develar

[zhaoterryy]

Does this only occur on first update? Try version 20.30.0 or greater. The fix for this issue was introduced in 20.29.1.