Followed this exactly to step 2:
https://docs.unrealengine.com/en-us/Platforms/Android/GettingStarted
When I get to the Accept SDK button, it doesn't accept or grey out. There are a few more people with this issue this month, and I have seen no solutions.
https://docs.unrealengine.com/en-US/Platforms/Mobile/Android/InstallingAndroidCodeWorksAndroid
I did this installation process as well.
Here's the button
I tried uninstalling and reinstalling and it didn't work.
I tried other engine versions of unreal and they didn't work. Issues were with 4.19.2, 4.18 and 4.17.
Unreal isn't clear in specifying that you need to locate the folder that contains the files, not just C:\NVPACK. Should be something like C:\NVPACK\Android-sdk-windows