What's the easiest and most reliable way to upgrade? If I don't want to wipe out existing data or have any complicated license key issues, Is it via Windows Update?
Mine wasn't showing up on the update, so I just did it by USB (with a sandisk usb/microusb stick). I did this for my PC before, so was familiar with this method. I only encountered one issue - drivers. But they are on here which was a life saver, and once installed my screen rotated backwards - so I reinstalled them and it all worked fine.Do I need USB sticks? I've seen recommendations to make a system image before attempting an upgrade, plus talk of using a USB stick for the install itself (is that necessary? I have about 10GB free on C, plus a partially filled micro-SD card - permanently installed due to Onedrive being located there).
Personally I have the 32gb model and I removed steam and all my games on there. In theory it shouldn't take much more space than is on there, but my advice is copy EVERYTHING to an sd/usb stick (just in case) and then update. You should be doing this regardless of system anyway, as accidents do happen.Is extracting the Windows 8.1 license key necessary?
I never even thought about this when upgrading my 3 devices. Luckily the answer is no I've heard Windows 10 doesn't show 'online only' placeholder files for Onedrive in file explorer. Annoying. But does it show them in the Onedrive app (assuming that still exists)?
I haven't synced my OneDrive to be honest so I can't help here, but the app still exists...so there's that. I've also heard Windows 10 doesn't allow Onedrive to be installed on the micro-SD card. Is that right? On Windows 8.1 I can get Onedrive on my card without any tricks.
Again, not tried, but if it does that just do the old trick to make your tablet/pc think the SD card is a harddrive, then it would