[Lenovo Yoga Book Guides, News, & Discussion] lectricpharaoh:
It should be automatic; you shouldn't need to do anything special. However, it does seem to depend on internet access, so you'll need to have that up and running for it to activate.

You can always check the activation status by popping up an elevated command prompt/PowerShell, and typing slmgr /xpr. You should get a little pop-up dialog (it might hide behind your command prompt window) telling you your activation status, like so:

This is a handy trick if you've NTLited away the Security Center in Settings (by killing off Windows Defender), as normally you have to navigate through there to check the activation status.

It sounds like there could be hardware differences between Yoga Books of the same nominal model (both of my Windows ones are the same model; I *think* the difference between YB1-X91F and YB1-X91L is that the latter has a SIM slot to support a cellular data connection), possibly due to which region they were released in. I got both of mine used off Craigslist, and while one has a standard US English keyboard, the other is appears to be a French one (I'm guessing Canadian Multilingual, since I live in Canada and got it locally). It looks like this (ignore the minor warping from my phone camera; it's not really bent):

I have noticed that this one does not turn off the display when I close it, which is annoying. I'm thinking it's a Windows thing, since there were so many little annoyances from day one. Examples include incorrect file size and free space values listed in Explorer (right-clicking and viewing Properties gives an accurate value, as does a directory listing from a command prompt), *extremely* slow listings of SMB shares (we have one of those Western Digital 'MyCloud' NAS devices, and every other device we have accesses the shares quickly and reliably), failure to shut off the display when closing the lid (meaning it wastes battery and is prone to 'phantom' input), and erratic Bluetooth connections. The slow network listing issue seems to have been addressed in an update, but the other issues persist.

The odd thing is I haven't noticed these issues on the other Yoga Book. File sizes are correct, network share listings are snappy, the display shuts off properly, and I haven't had Bluetooth dropping out (though to be fair, I'm only using it for a few minutes at a time as I test that various things seem to work).

Right now, I am removing crap I don't want, and testing each time (by installing on the *other* Yoga Book) in order to ensure I'm not breaking anything. I now have a full Yoga Book version with the latest updates, and absolutely nothing removed except for the Windows telemetry client. I also adjusted a bunch of things in Features and Settings, but none of that is permanent, so anyone using the .ISO could further adjust it to their liking, even from within Windows (as opposed to needing NTLite for it). That one seems to work perfectly. I then used it as a base for creating a trimmed-down version, and I seem to have broken the Windows Store. Specifically, the store app itself still works, but it cannot properly report my device specs, so some apps won't install because they don't know if my device meets the minimum requirements.

Anyways, when I'm done this, I will post the full version (replacing the one I already have on Google Drive, since that one didn't have the latest updates installed). I'll let you know when this happens, and if you like, you can try that one and see if it fixes your issue.

I will probably also post the trimmed version as well, once I've got it working to my satisfaction. That probably won't be for a few days, though.