Mandrake is not the problem, I know that it works very well.
did you copy your *whole* temp dir or did you just copy your 0xx.part files? you need to copy the whole directory that amule can use the part files.
Then, second step, you need to be sure that amule is searching in the right directory. The directory where amule searches for downloads (temp directory) can be set in "preferences"
Greetings, Citroklar