Internet Download Manager 5.14
S/N: ZFX1T-5VOMY-ZIT4Y-FHFPD

Internet Download Manager 5.14.1.0
S/N: Y30OZ-DNQH7-FRWPW-YYZMA

Internet Download Manager 5.15.6
S/N: Y5LUM-NFE0Q-GJR2L-5B86I
S/N: 4BTJF-DYNIL-LD8CN-MM8X5
S/N: XAGZU-SJ0FO-BDLTK-B3C3V

Internet Download Manager 5.19
s/n: SV8SX-FAFRT-0HZGT-6UG7S
s/n: YGF6Z-EHXJ3-GXSKJ-5XI8B
s/n: BBY1Q-XPXXW-793UP-HPMLZ
s/n: 098EM-6F1D5-FUT6O-3D0Q0
s/n: AMX7L-7B4Y3-P3OQK-HKFXT
s/n: UGLHD-J7QXS-U0CFU-AUDA0
s/n: Z7CBC-4DKD9-VVZE8-I1EA2
s/n: N5L02-1XWC4-ES3SA-WI8O9
s/n: 8VIGV-K6TJI-Z4Q0R-1YSKK
s/n: GC1JH-QWT26-1DJJR-KLHDY
s/n: TE78G-A9DU5-ZF5J2-CWFN0
s/n: 88Q6A-BF2G9-GKU3M-WGTZ2
s/n: OR77C-WH4AQ-PU0PH-6E9LF

Choose one as your version then..

Get out the other version by patch it, download it here :
http://www.4shared.com/file/258147111/4dc9eea9/Patch.html