I've just upgraded to PhpStorm 2017.3 64 bit on Windows 10
Initially it restarted itself OK, but after closing it it won't run, even after restarting Windows.
I'm not convinced the upgrade worked completely, because I can't find a folder under C:\ with a name containing '2017.3'.
The only folders I can see are
C:\Program Files\JetBrains\PhpStorm 2017.1.2
which has a modification date of 04 Dec 2017 (which looks correct)
C:\Program Files\JetBrains\PhpStorm 2017.1.2\bin\phpstorm64.exe
doesn't run the program - nothing.
I'm now left with an (apparently) unusable installation.
Thanks in anticipation for any help!