Update TOC.md

Author: jswymer

business-central/TOC.md

@@ -302,6 +302,8 @@
 ### [Set Up Base Calendars](across-how-to-assign-base-calendars.md)
 ### [Set Up Printers](ui-specify-printer-selection-reports.md)
 ### [Get Business Central on Your Mobile Device](install-mobile-app.md)
+### [Get Business Central on Your Desktop](install-desktop-app.md)
+
 
 ## Frequently Asked Questions
 ### [Frequently Asked Questions](across-faq.yml)