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Sometimes downloads may stall or slow down. Here are the most effective fixes provided by Steam Support : Steam Client Troubleshooting

You can cap your download speed in settings if you need to save bandwidth for other tasks. Download Steam

Once downloaded, open the SteamSetup.exe (Windows) or Steam.dmg (macOS) file. Sometimes downloads may stall or slow down

To begin your gaming journey, you must install the official Steam client on your computer. Download Steam