docs: Link to Cube Cloud for Excel in Microsoft AppSource

Author: igorlukanin

docs/pages/product/apis-integrations/microsoft-excel.mdx

@@ -30,7 +30,16 @@ Cube Cloud for Excel uses the SQL API internally. So, the SQL API has to be
 
 ## Installation
 
-You have to add this add-in to your Excel application via the <Btn>Add-ins</Btn>
+You have to install Cube Cloud for Excel into your Microsoft 365 organization.
+To do so, navigate to its [page in the Microsoft AppSource][link-ms-appsource]
+and click <Btn>Get it now</Btn>:
+
+<Screenshot
+  src="https://ucarecdn.com/8d451775-6b44-47b5-a682-87cb30f3f8e6/"
+  highlight="inset(23% 5% 46% 5% round 10px)"
+/>
+
+You can also add this add-in to your Excel application via the <Btn>Add-ins</Btn>
 button. Where this button is located depends on the [Excel version][link-excel-addins].
 For example, in Excel for the web, it's located on the rightmost side of the
 <Btn>Home</Btn> ribbon.
@@ -122,4 +131,5 @@ Click <Btn>Edit</Btn> to chnage the query or the location.
 [ref-views]: /product/data-modeling/concepts#views
 [ref-pre-aggs]: /product/caching/using-pre-aggregations
 [ref-sql-api-enabled]: /product/apis-integrations/sql-api#cube-cloud
-[link-excel-addins]: https://support.microsoft.com/en-us/office/add-or-remove-add-ins-in-excel-0af570c4-5cf3-4fa9-9b88-403625a0b460
+[link-excel-addins]: https://support.microsoft.com/en-us/office/add-or-remove-add-ins-in-excel-0af570c4-5cf3-4fa9-9b88-403625a0b460
+[link-ms-appsource]: https://appsource.microsoft.com/en-us/product/office/WA200008486