Added missing DownloadURLs and updates

Added DownloadURL to KB2756872, KB2770917, KB2779768, KB2795944, KB2811660, KB2822241, KB2836988, KB2845533, KB2840681, KB2855336
Also added download for KB2761094 and KB2764870 all part of KB2756872
Also added download for KB2782419, KB2783251 and KB2784160 all part of KB2779768
Also added download for KB2803676, part of KB2795944
Also added download for KB2800088, KB2812829, KB2815769 and KB2823233, all part of KB2811660
Also added download for KB2823516 and KB2851234, all part of KB2822241
Also added download for KB2850674, KB2853915 and KB2856758, all part of KB2845533
Also added download for KB2862073 and KB2866029, all part of KB2855336