I wanted to have a footprint for capacitor having mouser no: 710-860020475016 and package: AL10x10.5 . Please tell me how i can find that specific part and foot print for Altium designer. I have looked into all Altium libraries but didn't find that component.
Wurth have AD libs available for most of their stuff, but really for something like that you should probably just create it.
Creating footprints is a big part of the job, it is worth learning to do it.
http://katalog.we-online.de/en/pbs/WCAP-ATG5/860020475016 bottom of the page, there are download links for cad libraries if you really are that lazy, but you usually need to tweak them to conform to your house standards.