If you're looking for an end-to-end encrypted chat app that also handles file transfers and doesn't rely on intermediate servers, you might want to look at I2PChat (formerly I2PMessenger).

It's had an interface overhaul recently and is straightforward to use. No signup required, no metadata to log, a settings folder that's easy to migrate, and cross-platform.

To compile, you'll need to have Qt 5.14 or later installed; the source code is available at: https://vituperative.github.io/i2pchat/

If you're on Windows, a pre-built CI binary is available from: https://ci.appveyor.com/project/wipedlifepotato/i2pchat/build/artifacts