@TQKez-0 If you are running in standalone mode (no connected Raspberry Pi), all releases are on Github: https://github.com/Duet3D/RepRapFirmware/releases
3.5.0-rc1 is the top one, currently. It is not a final release, and there are a couple of issues to be resolved, so use with caution. You can always revert to 3.4.6 if you want.
If you are using an SBC (eg Raspberry Pi), you will need to switch to the 'unstable' release, see https://docs.duet3d.com/User_manual/Machine_configuration/DSF_RPi#switch-to-unstable-packages
Ian