download stop at 99.99%

hi...
i have some problem while downloading some nds rom
example :
-ff fables(U)
-custom robo arena(U)when download is almost complete at 99.99%, it just stop,and won't resume
i'm using IDM, the file won't rebuilding
but other rom's is just fine to downloadis there any solve for this problem?
thanks anyway :)

try not using a download accelerator, we don't support them.

It's working fine, this is not a bug.