I'm running a trial on PhpStorm 7.1.3 and I'm trying to create a Composer dependency to PHPExcel via the IDE's UI. I initialized Composer and then I went to Composer->Add Dependency and searched for PHPExcel. There were several choices and I figured I'd pick phpexcel/phpexcel. The Add Composer Dependency dialog told me that it's "depracated" and that I should use phpoffice/phpexcel. Fine, whatever (hopefully). However, when I clicked the Install button I get:
"Failed to install phpoffice/phpexcel version 1.8.0
CreateProcess error=2, The system cannot find the file specified"
I tried a bunch of other choices, just for the heck of it, and they all yield the same error.