A .dmg file should download
404 error
Operating system:
macOS
Version of Telegram Desktop:
n/a
The same for windows version
https://updates.tdesktop.com/tsetup/tsetup.1.2.6.exe - 404 not found
I've installed older version (1.1.10) and tried to update. Update fails:

The same for Linux version
@dscottboggs Thanks, should be fine now. Sorry :/
Most helpful comment
@dscottboggs Thanks, should be fine now. Sorry :/