The apps published on the Microsoft Commercial Marketplace require the following:

  • The desktop edition of Excel/Office 2016 or later versions, i.e., the downloadable and locally installed Excel/Office. Our apps don’t work with the web edition of Excel that runs inside web browsers.
  • Windows 10 or later versions.
  • X86 or X64 systems. Our apps don't work on ARM systems.

The screenshots below use Gantt Chart Maker for Excel as an example.

  1. First, you visit the subscription portal at, click the menu "Subscription Portal", "Apps", and then click "Download" to download the installer file.

    Download the appinstaller file

  2. Open your "Downloads" folder and double-click the file you downloaded.

    Start the installer

  3. Click "Install" to begin the installation procedure. If "Launch when ready" is checked, the app starts automatically when the installation is finished.

    The installer

  4. This is what you’ll see when the main app starts for the first time. It is usually referred to as the "main app" to distinguish it from the add-in that runs inside Microsoft Excel. The main app gives a short introduction of the app, the ability to install an add-in to Excel (which is usually done automatically), and the ability to let you sign in.

    The main app

  5. Go to the "License and Support" tab. Make sure it shows the message "Licensed to <your account>. If you want to change your account, click "Change Account".

    Verify license

  6. Start Excel, Go to the "UniformSoftware" (or "BoostExcel") ribbon tab and click "Add New Gantt Chart" in the "Gantt Chart Maker" tab.

    The UniformSoftware (or BoostExcel) ribbon tab

  7. This screenshot shows the main working ribbon tab of Gantt Chart Maker.

    Gantt Chart Maker add-in for Excel