CastXMR 1.3 and CryptoNight Saber will be included in the next development version, planned to be available within the next 1 - 2 days.

I can also point of a new feature available in the latest development version (5.2.4), where you can specify where Awesome Miner should download the mining software from.

If the automatic download feature in Awesome Miner is on CastXMR 1.2.5 as in the example below, you can change that to point to version 1.3.0 instead. With this change, Awesome Miner will download and run the 1.3.0 version instead.

Earlier you could of course manually download the software and then upload it to your miners, but this process should make it a bit easier as it's based on the automatic download concept.

Please go to the Options dialog, Managed Software section, and edit CastXMR as illustrated in the screenshot below.