2 Answers

Try the links here :https://www.google.co.uk/search?q=idm+serial+num&rlz=1C1CHIK_enGB517GB517&aq=f&oq=idm+serial+num&aqs=chrome.0.57.1139550j0&sourceid=chrome&ie=UTF-8

How to find IDM serial number

Instructions
1
Locate your IDM download instructions. The download instructions were provided to you by email and contain the serial number for the software.

2
Request the registration information, including the serial number. Complete and submit the request form. (See Resources.) Be sure to enter the same email you used when you originally registered the software. IDM will send the serial number to you by email.

3
Find the IDM serial number using a key finder software. Password and Key Finder, Magical Jelly Bean Key Finder, Key Finder Thing and Enchanted Keyfinder will all scour your system for serial numbers for any program currently installed, including your IDM software. Both Key Finder Thing and Enchanted Key Finder are free.

Read more: How to Find an IDM Serial Number | eHow http://www.ehow.com/how_7551308_idm-serial-number.html#ixzz2Sojlrd8j