What do you mean with update, do you want to keep your files? You can download the media creation tool from microsoft, then choose the iso option, it will create and download an iso image of windows 10, after that you can make that iso bootable with a usb and install on your pc, if i'm not wrong you can then choose either do a clean install, which will erase all data on your drive and give you a fresh w10, or you can choose to keep data, it will create a folder with things from your previous windows.