This task is one section of Odoo administration: seven setup tasks for admins, with 6 related tasks on one page.
1. Back up first
If this database has data you need, take a backup before you install. A module can add menus you did not expect, and a backup is the way back.
2. Find the app
Open Apps and search for the app name. On a server you run yourself, update the apps list first if the app should be there and is missing.
3. Install and open it
Click Install and wait until it finishes. Open the new app from the menu. If the install errors, read the message and do not click Install again until you know why.
4. Leave unknown files alone
Do not upload a zip or a module you cannot rebuild from a source you trust. Test that on a copy of the database, not on the live one.
5. Frequently asked questions
Will Install delete my data?
A normal official app install adds features. It should not be how you remove data. Still back up first when the database matters.
What if the button says Upgrade?
The app is already installed. Upgrade only when you mean to update that module.
Can I uninstall if I dislike it?
You can try, but uninstalling an app that already has records is riskier than installing it. Decide before you enter real data.
6. Related articles and next steps
Menu labels vary with your Odoo version, installed apps, and permissions. Compare them with the Odoo 19 applications documentation when a label differs.
Continue learning
Describe the version, hosting, and workflow you want to improve. Email OdooMatrix to discuss the next step.