====== How to prevent your Mac from automatically upgrading to Mac OS 10.15 Catalina  ======
=====Product====
|              ^ Name                            ^ Version      ^
^ System      | OSX                        | Mac OS 10.12 (Sierra) and  previous version        |



===== Description =====



After system updates, it often happens that previously installed software becomes incompatible.

The roaringapps.com website lists all 32bit software that will NOT be compatible with Catalina Mac OS 10.15:  [[https://roaringapps.com/collections/list-of-32-bit-macos-apps]]

This article explains how to prevent your Mac from automatically upgrading.

===== If you're using Mac OS 10.12 (Sierra) and previous versions =====
  * Open System Preferences\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:preference_systeme.png?250|}}
  * Select "App Store"\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:app_store.png?400|}}
  * Make sure the box "Install macOS updates" is **unchecked**.\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:decocher_maj.png?450|}}


===== If you're using Mac OS 10.13 (High Sierra) or 10.14 (Mojave) =====
  * Open System Preferences\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:preference_systeme2.png?200|}}
  * Open System Preferences\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:software_update.png?400|}}
  * Select "Advanced"\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:software_update_advanced.png?400|}}
  * Make sure the box "Install macOS updates" is **unchecked**.\\ {{fr:technique:knowledge_base:osx:empecher_mise_a_jour_os_automatique_mac:decocher_maj2.png?400|}}

===== Reference =====

**Author** : MIESCH Alexander

{{tag>osx update}}<WRAP hide>{{tag>amiesch}}</WRAP>