photoshop X6 application disappeared from Win 10

Hi,

Strange things just happened.  I was using photoshop X6 earlier today.  Did a restart this afternoon, went to open photoshop as usual by searching with cortana, and only photoshop express shows up.  Searching the installed apps and program files folders reveals no trace of phtoto shop.  I realise it a bit old, but could it have just expired and been removed from by PC with no notification whatsoever?

Thanks,

Phil