Sideload the manifest (Windows / Mac)

In some organizations, AppSource is restricted by IT policy. In that case, you can install the Relm Pro Excel add-in from its manifest XML directly. This page covers the mechanics on Windows and Mac.

Recommended path: Install from AppSource is simpler and handles updates automatically. If your IT team manages add-ins centrally, they can upload the manifest in the Microsoft 365 admin center (Integrated apps) so everyone in your organization gets Relm Pro. Microsoft describes the per-computer methods below as testing tools, so use them only when neither option works.

Get the manifest

Contact support for the Relm Pro manifest file. Sharing it doesn't grant anyone access to your data — everyone still signs in with their own Relm account.

Sideload on Windows

1. Open Excel.
2. File → Options → Trust Center → Trust Center Settings → Trusted Add-in Catalogs.
3. In Catalog Url, enter the network path of a shared folder that contains the manifest (a local folder path won't work — share the folder first), then click Add catalog.
4. Tick Show in Menu, then click OK.
5. Restart Excel.
6. Home → Add-ins → Advanced → SHARED FOLDER — pick Relm Pro and click Add.

Microsoft's full guide is at learn.microsoft.com/en-us/office/dev/add-ins/testing/create-a-network-shared-folder-catalog-for-task-pane-and-content-add-ins.

Sideload on Mac

1. Quit Excel.

2. Place the manifest file at:

   ~/Library/Containers/com.microsoft.Excel/Data/Documents/wef/
   

   You may need to create the wef folder if it doesn't exist.

3. Re-open Excel.

4. Home → Add-ins — pick Relm Pro.

Microsoft's full guide: learn.microsoft.com/en-us/office/dev/add-ins/testing/sideload-an-office-add-in-on-mac.

After sideload

A Relm Pro button appears on the Home tab. Click it and sign in — see Sign in to the Excel add-in.

Updates

Sideloaded manifests don't auto-update like AppSource. If we ship a manifest change (rare — usually only when adding a new ribbon button or icon), we'll announce it. To get the new version: ask support for the updated file, replace the old one in the same location, restart Excel.

The add-in itself is served from excel-plugin.relm.ai and updates independently of the manifest, so most updates ride out without action.

Excel for the web

Sideloading works on Excel for the web too, via a different path:

• Home → Add-ins → More Settings → Upload My Add-in and select the manifest file.

This installs the add-in for you, in that browser only — if you clear the browser's cache or switch browsers, upload it again. To make Relm Pro available to everyone in your organization, ask your Microsoft 365 admin to deploy it from Integrated apps.

Common issues

• "Manifest is not valid." The manifest version may be too old; ask support for the current file.
• "Add-in does not load." The add-in's web content lives at excel-plugin.relm.ai; if your network blocks that, the taskpane won't render. Whitelist excel-plugin.relm.ai and relm.ai in your firewall.
• Mac, "An error occurred while opening the add-in." Sometimes a stale wef cache. Clear the wef folder, replace the manifest, restart Excel.

What's next

• Install from AppSource (the easier path)
• Sign in to the Excel add-in
• Excel troubleshooting