Hey! Thanks so much to you and MPMB for the responses. Turns out I was in fact just confused about the difference between the Microsoft app and the actual Adobe Reader. Downloaded reader and the sheet works just fine, and it's truly a great resource. :)
Sorry, they're retiring use of it on Windows 10 devices.
That's a screenshot I just took, having downloaded and opened one of the character sheets in Reader.
If the picture doesn't work, here's a link to an article about it...
Just wondering - is there a plan now that Microsoft is retiring Adobe Reader? Will the sheets be compatible with any other program? I'd love to use them for my upcoming game but I don't want to spend time in them only to lose access on the 15th.