Created attachment 176015 [details]
KNS update log

STEPS TO REPRODUCE
1. Have KNS content available for update
2. Update it
3. Update process gets stuck at 34% with no errors, warnings, or notices shown in the UI.

Debug logging shows the issue, though: a whole bunch of this:

kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/2040022/1")
kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/1256209/1")
kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/2139746/5")
kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/1367056/1")
kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/2137844/1")
kf.attica: executing Get request for QUrl("https://api.kde-look.org/ocs/v1/content/download/1367056/1")
kf.attica: error found QNetworkReply::ContentReSendError
kf.newstuff.core: job error:  1  status code:  0 ""
KNS error in "Wallpaper Plugins" : KNSCore::ErrorCode::NetworkError "Network error 0: Server stopped accepting new streams before this stream was established" QVariant(int, 0)
invalid kns backend! "/home/nate/kde/usr/share/knsrcfiles/wallpaperplugin.knsrc" because: "Network error in backend Wallpaper Plugins: 0"
kns error "/home/nate/kde/usr/share/knsrcfiles/wallpaperplugin.knsrc" "Network error in backend Wallpaper Plugins: 0"
kf.attica: error found QNetworkReply::ContentReSendError
kf.attica: error found QNetworkReply::ContentReSendError
kf.newstuff.core: job error:  1  status code:  0 ""

error 1 but status code 0? And no messages shown to the user? Seems non-ideal. It should at least have the decency to fail and show an error message in the UI.

Full log attached.