Asiatic Black Bear:

Go to C:\ProgramData\Microsoft Games\Zoo Tycoon 2\downloads\zootycoon_com_zt2_1033

and drop the 1018_1.0 files there. (do NOT take the .z2f file out of the 1018_1.0 folder!)

Once that's done go to:
C:\ProgramData\Microsoft Games\Zoo Tycoon 2\downloads\zootycoon_com_zt2_1033\1015_1.0
Open LeopardAndDummy.z2f with Winrar or Quickzip and go to LeopardAndDummy.z2f\AI\Tasks\enrichment
and replace the StuffedPrey.tsk file with the one in the download.

Then go to:
C:\ProgramData\Microsoft Games\Zoo Tycoon 2\downloads\zootycoon_com_zt2_1033\1017_1.0
Open HolidayPack.z2f with Winrar or Quickzip and go to HolidayPack.z2f\AI\Tasks\enrichment
and replace the Presents.tsk file with the one in the download.

Addax:

Go to C:\ProgramData\Microsoft Games\Zoo Tycoon 2\downloads\zootycoon_com_zt2_1033

and drop the 1029_1.0 files there. (do NOT take the .z2f file out of the 1029_1.0 folder!)

Enjoy! :)