Thank you Eric, that worked! I wasn't aware you could remove architectures from a fat binary. I will make sure to remember this!

Gianluca, that solved my issue. I would still recommend delivering xcframeworks or SPM packages for the future (or even better provide Swift source code). If you were in the process of rebuilding Lightstreamer Allegro Presto Vivace 6.1.0 (unified API 2.1.3) as I requested, I would kindly ask you to keep doing it and add support for macOS ARM64. That architecture is not currently available in the Lightstreamer download page (only macOS x86_64).