Installation (Manual)
To install manually, start by downloading the app package.

Navigate to your SharePoint app catalog.
If you don't have one, or don't know where it is, you can find it by visiting this page:
Select Apps for SharePoint:
Upload the .sppkg file to the App library. You may optionally tick "Make this solution available to all sites in the tenant". Click Deploy.
The solution will be deployed to your tenancy:

You can skip this step if you selected "Make this solution available to all sites in the organization" above.
Now that you've uploaded the app package, you can install it to a SharePoint site.
Navigate to your site and click on Site Contents. Select New > App:
Select the 365Automate app to install.
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Upload to SharePoint
Install to a Site