This topic specifies the administrative tasks required for adding a 25Live spud to modern SharePoint sites. (For classic SharePoint, go to Add calendars to SharePoint sites.)
To make the 25Live SharePoint web part available on your modern SharePoint site, you need to install the custom web part.
Important: These tasks should be completed by your organization's SharePoint administrator (an admin for your organization's SharePoint tenant). The administrator can verify that your organization has established its modern SharePoint site.
For assistance, contact Support.
(After the 25Live web part is installed, see: Add calendars to modern SharePoint sites.)
To locate your app catalog site:
If an App Catalog Site is already there, skip to step 2.
or
If there's no App Catalog Site, you need to create one -- see: Use the App Catalog ...
Tip If you don't see an Upload button, you may not have administrator permissions for the app catalog site. (You may be an admin for your organization's SharePoint tenant, but not for the app catalog site.) For more information, contact IT at your organization.
https://25livepub.collegenet.com/25live-sharepoint.sppkg
Select Make the solution available to all sites in the organization (unless you want to specify a subset of your sites that will not be using 25Live), and then click Deploy to upload the package file.
Note If you don't select Make the solution available to all sites in the organization, you'll need to add the 25Live package file to each site that uses 25Live individually.
Click the + button, and then click 25Live Publisher.
(Next, see: Add calendars to modern SharePoint sites.)