Mac OS 10.10.1はPT11.3が対応してます。
http://avid.force.com/pkb/articles/ja/Download/Pro-Tools-11-3-Info-Downloads?retURL=%2Fpkb%2Farticles%2Fja%2Fcompatibility%2FMac-OS-X-10-10-Yosemite-support-for-Media-Composer-Pro-Tools-Sibelius-EUCON-and-ISIS&popup=true