hey tried download latest upgrade in menu , can't sign in lightroom @ ... application not respondi ng. i not cc member .... did't realise upgrade available cc members. went section & saw these upgrade available.... can't open lightroom @ all . i'm on os x el capitan version 10.11.6 uninstall problematic lr , reinstall lr using installation file , serial number. downloadable installation files available: suites , programs: cc 2015 | cc 2014 | cc | cs6 | cs5.5 | cs5 | cs4 , cs4 web standard | cs3 acrobat: dc, xi, x | x suite | 9,8 | 9 pro extended exe , 9 pro extended 7z | 9 standard | 8 standard captivate: 9 | 8 | 7 | 6 | 5.5, 5 | 1 cold fusion: 11, 10 | 9.0.2, 9.0.1, 9.0.0, 8.0.1, 8.0.0, 7.0, 6.1, 6.0, 5.0, 4.0 contribute: cs5 | cs4, cs3 | 3,2 framemaker: 12, 11, 10, 9, 8, 7.2 lightroom: 6.6.1 | 6 | 5.7.1 | 5 | 4 | 3 photoshop elements: 14,13,12,11,10 |...