I use (a customized version of) the EasyUnicode keylayout on a Mac running Yosemite, with no problem.  Are you sure that you were not putting the file in the wrong folder.  Keylayout files (which appear in that upper right corner) should go in the keylayout folder, not the fonts folder — whatever keylayout you were using before should still work, if you just reinstall it in the right place:

Macintosh HD > Library > Keyboard Layouts

Timothy Lubin

Professor of Religion and Adjunct Professor of Law

Washington and Lee University

Lexington, Virginia 24450

http://home.wlu.edu/~lubint 

http://wlu.academia.edu/TimothyLubin 

https://twitter.com/TimothyLubin

ḷ

From: INDOLOGY <indology-bounces@list.indology.info> on behalf of Mrinal Kaul <mrinalkaul81@gmail.com>
Date: Monday, August 3, 2015 at 10:15 AM
To: Indology List <indology@list.indology.info>
Subject: [INDOLOGY] Diacritical Sanskrit Problem in OS Yosemite

Dear Friends,

Just yesterday I had to reformat my Mac and I discovered that I have shifted from OS Maverick to OS Yosemite. While on Maverick I was using a Unicode keyboard option (on the right corner up there) that I had manually put in the Fonts folder (inside the System folder), however this does not seem to work with Yosemite. I do not want to use US International PC option for writing diacritics. Is there some better, easy and straightforward method to solve this problem? I would appreciate any help.

Best wishes.

Mrinal Kaul

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Mrinal Kaul
Manipal Centre for Philosophy and Humanities (MCPH)
Dr. TMA Pai Planetarium Complex
Alevoor Road
Manipal, Udupi 576104
Karnataka, INDIA

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Tel: +91-820-2923567 (O)

https://manipal.academia.edu/MrinalKaul

e-mail: mrinal.kaul@stx.oxon.org