Updates to your operating system correct potential bugs and security holes and remove out-of-date software that might be causing your device to run slowly.
In order to select the Custom option in Setup, you must first boot from the installation media. Second, if you choose the same partition as an existing Windows installation, you will lose access to that Windows installation. You must install Windows 10 on a different disk partition or physical drive.
Make a data backup. When you realize you might never receive all the files you forgot to store somewhere back, you have a feeling of dread that is difficult to forget. Make a backup of everything before updating. You may choose to use cloud storage.
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