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Method 1 — Upload My Add-in (try this first)

1. Open Excel.
2. Go to the Insert tab.
3. Click Get Add-ins (or My Add-ins — whichever you see).
4. Look for a link called Upload My Add-in (sometimes under a "MY ADD-INS" tab, near the top of the window).
5. Click it, browse to the manifest.xml file you were sent, select it, and click Upload.
6. Go to the Home tab — you should now see a Tally Delta button on the ribbon. Click it and the task pane opens on the right.

Method 2 — Shared Folder (only if "Upload My Add-in" isn't available)

Some Excel installations don't have the upload option above. If that's you, use this instead:

1. Create a new folder anywhere on your computer, e.g. C:\TallyDeltaCatalog.
2. Copy manifest.xml into that folder.
3. Right-click the folder → Properties → Sharing tab → click Share.... Add yourself (or type "Everyone"), click Add, then Share, then Done. If Windows asks about network discovery, choose the "private network" option, not the public one. Note the network path Windows shows you at the end — it looks like \\YOUR-COMPUTER-NAME\TallyDeltaCatalog.
4. In Excel: File → Options → Trust Center → Trust Center Settings… → Trusted Add-in Catalogs (in the left list).
5. Paste that network path into the "Catalog Url" box, click "Add catalog," then check the box next to it labeled "Show in Menu." Click OK, then OK again.
6. Fully close every Excel window (not just the one you're in), then reopen Excel.
7. Insert tab → My Add-ins → you should now see a "SHARED FOLDER" tab. Click it, find Tally Delta, and click it to add it.
8. Go to the Home tab → click the Tally Delta button and the task pane opens on the right.