go to https://kat.cr/usearch/idm/ and download the idm according to your system requirements
Now install the idm and open the idm.you will see the message the your idm serial key is expire please register you idm.
Now open the downloaded folder of idm and copy the IDMan.exe from the “crack folder” which is in side the idm main folder.
Go to drive “C” where you idm is install and then past the IDMan.exe and replace the existing IDMan.exe file.
Now close the GOOGle chrom and re-open it and follow these step to add extension of IDM to google chrome.