Can't create c++ files

Sorry, here’s a better view of it, with some new errors after uninstalling VS2015 and installing VS2017 by Unreal command, when it can’t find one and prompts you to the download.
Answering your question, I add the SDK for both windows 10 and the windows 8.1 sdk from VS installation screen. Should I have both VS2015 and 2017? I really never had this problem before…
Thanks for your time, by the way
Edit: Also, a very weird thing, there is no “compile” button on the editor… it’s missing

248960-error2.png