There is no need to purchase a Windows 10 install drive - you can easily prepare the same thing yourself using a blank flash drive. Windows 10 will pick up the license key from the system board and activate on connection to the Internet. See here [URL]  
I purchased a Dell Laptop approx 11 months back, recently i was given the option on upgrading to Win 11 by Microsoft. This didn't work and all i get now when booting up is a message  " Attempting Repair " and after a while couldn't repair.  When i purchased the laptop i was given the option to but a USB stick with Win 10 on to reinstall it. I have emailed Dell twice now through the support centre asking how to but one and they never reply. I have seen Dell win 10 usb sticks for sale new for about £17.00, if i was to buy one would i run into issues with the Microsoft Installation Key Code, none was given when i bought the laptop. I have given up on Dell ever replying. There after service has been abysmal. Any help appreciated
Dell Win 10 USB Stick