Hello,
I have 4.3.5 (From here) and I'm using Php 5.6 (Native). I tried to make it PHP 7.0 and saved it but when I save it and go see my site I get an error 500. I switch it back to 5.6 and it's fine. What do I have to do to make it php 7.0 ? I simply went to Select PHP Version and chose 7 but apparently that isn't enough.