Can't install Lettera beta on macOS 15

[trix180]

Lettera is available for macOS 26 (or 27 beta). More info here:

Support Sequoia

I completely understand the frustration, and I’m sorry the 26+ requirement is a blocker for some of you. The short version: Lettera is built around the new macOS design language, and supporting older versions would have meant a lot of extra work for relatively little return. We’d rather put that effort into making the app great on the platform it targets than spread ourselves thin maintaining compatibility layers for older systems. It’s not a decision we took lightly, and I know it’s not the a…