Note: Before you begin, confirm that your organization meets all requirements for using Centralized Deployment, as described in Determine if Centralized Deployment of add-ins works for your Office 365 organization.
If your organization meets all requirements, complete the following steps to publish an Office Add-In via Centralized Deployment:
Add-Ins are installed into Outlook using manifest files. Our manifest file can be accessed here: https://evokosmartspacefirmware.blob.core.windows.net/evoutlookaddin/ev_prod_OutlookWebAddIn.xml
Step 1: Sign in to Office 365
Sign in to Office 365: https://portal.office.com with your O365 Administrator Email and Password
Step 2: Open Integrated Apps
Select the app launcher icon in the upper-left and choose Admin.
In the navigation menu, press Show more, then choose Settings > Integrated Apps.
Click on the Add-Ins button once the Integrated Apps page has loaded.
Step 3: Deploy Add-In
Choose Deploy Add-In at the top of the page. 
This will open a panel with guided steps for installing Add-In.
After reviewing the requirements, Choose Next.
Step 5: Deploy a Customer Add-In
On the Deploy a New Add-In select the Upload Custom Apps button.
If you downloaded the manifest file to your machine, then select the option "I have the manifest file...".
Alternatively, select the option for "I have a URL" and enter: https://evokosmartspacefirmware.blob.core.windows.net/evoutlookaddin/ev_prod_OutlookWebAddIn.xml
Click Upload