I had a Windows Phone 8.1 project running on VS2013. Then, I upgraded to VS2015 and installed the Windows 10 SDK.
After that, when I opened the solution again, there was a message telling me that the project could not be loaded and I'd have to download and install Windows Phone 8.1 SDK.
Done that, everything is working fine, but when I tried to add a WP10 project to the solution it tells me to install the Windows 10 SDK.
Is there a way the two SDKs could be friends and live happily on the same machine?
I first got Windows Phone 8.1 SDK installed, then I clicked the Change option in Add/Remove programs, checked the Windows 10 SDK and now everything's working.
That's the same thing I'm almost sure I did the first time, but what matters is that's working now. =D
Thanks everyone!