For windows, you'll need a modern 64-bit Java. It will work with anything greater than 8, however it was only in 10 or 11 that the OS UI scaling was respected so if you have a high resolution display you'll want newer. 64-bit is required.
For Windows and macOS, java can be downloaded here:
For linux, you probably want the openjdk from your package manager.
The Channels GUI includes all the Snowblossom IceLeaf client features with additional Channels features. It can run a full node or act as a light client using other full nodes for blockchain data. It supports creating wallets, sending and receiving.
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