Can't download dSYM file from iTunes connect

Do you still have the archive available in Xcode as you can save them out from there:

1. Select Window -> Organizer
2. This will open up Organizer window containing your archives.
3. Right click on Archive and select 'Show in Finder'.
4. Right click archive in finder and select 'Show Package Contents'.
5. Project.xcarchive contains dSYMs, Info.plist and Products.
6. dSYMs folder contains dSYM file of your project.

You can enable the Debug Symbol file generation during build within Xcode as below.

It seems 'Download dSYM file' link is intended for downloading dSYMs generated by App Store when bitcode is enabled. Thus if bitcode is disabled for your application dSYM files are contained by your Mac. If bitcode enabled the final compilation of your binary will be execute on App Store and new dSYM will be generated. And new dSYM you will be able to download from App Store Connect with 'Download dSYM file'.

See 'Bitcode' section in Apple documentation.

I had a similar issue and the accepted answer didn't work for me. AppCenter was asking for some missing symbols, and it didn't accept the ones from the app's archive (it needed the dSym's with random letters and numbers in the file name)

In AppstoreConnect, All Builds -> Current Version -> Current Build -> Includes Symbols said YES, but no download link. BitCode was enabled when I published the app.

I just waited a couple more days (I think that there were 5 days in total) and the Download dSYM link appeared.