You need to mark each file you upload with what OS is it compatible.
If you don't do that the launcher can't tell what file you have to download.
I can run the web version (the launcher itself does that) just wanted to point this out.
In this image you can see when you upload you can mark the OS of the file and I guess you didn't mark any OS it for any of the uploaded files
EDIT: Did a test doing a page draft and uploading some random zip and not marking and It seems I can edit the OS of each file in the Edit page so should be just a moment to do it.
