This is the best download manager which i have come across till now!! patch it to make it a full version!!

1)  Download internet download manager from this website
        http://www.internetdownloadmanager.com/

2)  It provides 30 days trial version for free after that you have to buy full version.

3) hack it to make it full version by patching it using crack!!

4) download patch from HERE OR from HERE

5) After patching enjoy it as full version after every update to new version of idm , continue the same process and patch it!!