Yes, this appears to be a recurring issue with versions going way back, but I didn't encounter this until fairly recently with a Windows update a few weeks ago. You can download the app via command line as per this video 40:50 mark (and my brilliant colleague @JoeRogan). Rename the '0' to your app id. The app will be downloaded to the folder from which you ran the script.
node -e "require('./server/src/middlewares/dev/apps/app-download.js').zipApp('0', 'app.zip');"
There appears to be some conflicting permissions issues with writing to the temp directory which we haven't yet sorted out.