Best Way To Upgrade SugarCRM 9.1 To Latest Version

I would recommend backup yours system before the upgrade  and in between upgrades  also check (php, mysql and Elastic search) versions required between SugarCRM upgrades, if you are on the wrong version it might cause some issues .

Recommend do the upgrade  via Silent Upgrade  , build your commend before, as you know you need also to migrate from Profissional to Enterprise. 

Yes Thanks For Support,

I am Using Sugarcrm Ent 9.01

We are Trying to Upgrade to V12.

 Upgrade as per following upgrade packages: -- 

1. Sugar Ent 9.0.1 - to – 9.0.3 version 

1. Sugar Ent 9.0.3 - to – 10.0.0 version 

1. Sugar Ent 10.0.x - to – 10.0.5 version 

1. Sugar Ent 10.0.5 - to – 11.0.2 version 

1. Sugar Ent 11.0.2 - to – 11.0.3 version 

1. Sugar Ent 11.0.3 - to – 12.0.0 version 

Yes Thanks For Support,

I am Using Sugarcrm Ent 9.01

We are Trying to Upgrade to V12.

 Upgrade as per following upgrade packages: -- 

1. Sugar Ent 9.0.1 - to – 9.0.3 version 

1. Sugar Ent 9.0.3 - to – 10.0.0 version 

1. Sugar Ent 10.0.x - to – 10.0.5 version 

1. Sugar Ent 10.0.5 - to – 11.0.2 version 

1. Sugar Ent 11.0.2 - to – 11.0.3 version 

1. Sugar Ent 11.0.3 - to – 12.0.0 version 

I am not sure how you setup your environment but you will need to check you php version between upgrades. if you doing it via command line will be easier as you can point to the php version required by sugar.