Upgrading Bizagi's version is a really simple procedure.
Given that Bizagi is a model-driven solution, a Bizagi project upgrade mainly involves an upgrade to the database, and some other quick steps to upgrade the other components (such as the Work portal) into a new version.
It is recommended to periodically upgrade your project's Bizagi version.
Refer to Version upgrade for further information.
If you are using a Bizagi version 10.4 or older (formerly known as Enterprise, Xpress or JEE editions), refer to Upgrading to 10.5 for a detailed explanation on the 10.5 Bizagi Suite concepts and upgrade considerations.