Mumble (client): download ældre versioner

This is the sixth stable release of the 1.5 series.
Release announcement: https://www.mumble.info/blog/mumble-1.5.939/
Known issues
- We are unable to provide new pre-compiled macOS binaries for the 1.5 series.
- Overlay blocked by CS:GO Trusted Mode

This is the fifth stable release of the 1.5 series.
Release announcement: https://www.mumble.info/blog/mumble-1.5.915/
Known issues
- We are unable to provide new pre-compiled macOS binaries for the 1.5 series. Please read the blog post for more information.
- Overlay blocked by CS:GO Trusted Mode

This is the fourth stable release of the 1.5 series.
Release announcement: https://www.mumble.info/blog/mumble-1.5.901/
Known issues
- Windows server crashing when bonjour option is enabled. Disable this option for now to fix the crash #7071
- macOS binaries not being signed/notarized #4263
- Overlay blocked by CS:GO Trusted Mode

This is the third stable release of the 1.5 series.
Release announcement: https://www.mumble.info/blog/mumble-1.5.857/
Known issues
- macOS binaries not being signed/notarized #4263
- Overlay blocked by BattleEye (Whitelisting request has been ignored)
- Overlay blocked by CS:GO Trusted Mode

This is the second stable release of the 1.5 series.
Release announcement: https://www.mumble.info/blog/mumble-1.5.735/
Known issues
- macOS binaries not being signed/notarized #4263
- Overlay blocked by BattleEye. A request to whitelist it has been made. We received no response.
- Overlay blocked by CS:GO Trusted Mode