For MSFS2020 you need an application called “Navigraph Navdata Installer” (not the FMS Data Manager, which only supports FS9, FSX, P3D, XP10 and XP11) - you can download the latest version from here.
How to install the “Navigraph Navdata Installer” from scratch
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close your sim
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download the latest setup
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start the setup normally (with no Admin-Right option)
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select a folder outside the sim-folder in any folder your choice
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when the application starts, login with your Navigraph credentials
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after the sign-in the application starts automatically and you can press the INSTALL-button to install the latest AIRAC cycle/revision
How do you UPDATE the “Navigraph Navdata Installer”
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close your sim
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open the “Navigraph Navdata Installer” - in most cases it´s hidden in the system tray (taskbar, right beside the clock).
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when the application opens, press the red “REMOVE” button to remove the current installed AIRAC dataset
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close the application and in the windows settings under “Add or remove programs”
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look for “Navigraph” and press the “uninstall” button
After that go ahead with the instructions above “How to install it from scratch”