For Dell, press F8 on the keyboard until the Advanced Boot Options menu appears on the screen. For HP, press F11 directly after powering up the unit. For LG, press F11 directly after powering up the unit. For Toshiba, press and hold '0' BEFORE and during the power up. Microsoft no longer sells 8.1. You would have to take your chances online. Warning: You do not buy a Product Key by itself, as they are normally stolen/pirated, Volume Licenses which are not for private use, or MSDN keys which are not to be sold by the original subscription holder. Once you have the Windows 11 Pro upgrade key, you can go to Settings > Update & Security > Activation on your Windows 11 Home laptop and click on the "Go to Store" button to purchase and activate the upgrade. Regards. I need to buy another windows product key for a new laptop i've purchased. I already have the installation media for 8.1, so would prefer to avoid buying another copy and waiting for it to be delivered. Anytime i go to the windows store to purchase, it just defaults to the "still running 8.1 preview?" page. I have Asus Zenbook with pre-installed Windows 8 (normal, not pro). I installed clean Windows 8.1 and couldn't get it activated. It asked license key, which I didn't knew. I was able to retrieve my licence key from BIOS (MSDM KEY) with WpKey util (pkeyui.exe). Windows 8.1 accepted this key and I was able to avoid all this "re-install Windows 8 Step1: Click the Start button and hit the PC settings in the search box. Step2: Select the option of Activate Windows from the PC setting. Step 3: Copy Windows 8.1’’s product key and paste it. Then click Next. Step 4: A set of instructions will pop up on the screen. Buy it with. This item: Microsoft Windows Professional 8.1 English 1 License. $19000. +. CORSAIR VENGEANCE DDR5 RAM 32GB (2x16GB) 5600MHz CL36 Intel XMP iCUE Compatible Computer Memory - Black (CMK32GX5M2B5600C36) $16969. +. Follow up: I tried to change my Win11 Home product key to the (Key removed) Win11 Pro generic product key, expecting that the result would be a unactivated copy of Win11 Pro on which I could try my Win8 Pro keys or even a Win11 Pro key from the MS Store. However that didn't work, because the upgrade procedure starts and immediately stops and zzKb.

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