A couple of thoughts. Lilypond can be installed and run on 15.4 because I’ve got it running. My apologies if the below is not news to you and you already know this stuff. It’s easy to find oneself mansplaining on the Internet.
1. Perhaps don’t use Firefox for downloading. Try Safari, I find it works better than Firefox or especially Chrome. 2. Just download the .dmg Disk Image file. Downloading ‘lilypond-x.y.z-darwin-x86_64.tar.gz’ is redundant. If you double click on ‘lilypond-x.y.z-darwin-x86_64.tar.gz’ in the downloads folder, it should be unpacked to either source code which has to be compiled, or to the same application file as is in the .dmg. For Mac users, the .dmg is easier. 3. Double click on the .dmg, which should be in the Downloads folder on the desktop and accessible in the Dock. That will open and should have its own window, then drag the Lilypond app from the .dmg window to the Applications folder. You have to take that step to install it on your hard drive. Installation is handled automatically when getting something through the App Store, but not with applications downloaded outside Apple’s walled garden. 4. Apple will resist installing, opening and running Lilypond because it did not come from the App Store and there is a dialog box or two to navigate with a button that says something like “install and run anyway.” You should be then able to choose that version of Lilypond in the Frescobaldi preferences nd go from there. Hope this helps! > On May 14, 2025, at 2:25 PM, Lydia Westerberg <lwesterb...@gmail.com> wrote: > > My iMac has sequoia 15.4.1 and I simply am unable to > install the new version of lily pond. > These are the steps I took with assistance from two apple :”troubleshooters”. > <Step by step download lilypond.docx> > > I also took these steps offered by a lilypond user: > https://lists.gnu.org/archive/html/lilypond-user/2024-04/msg00144.htm > > Lydia
