But few days ago, with the latest update version 6.18 build 7 (released on Nov 09, 2013) Internet Download Manager was literally had a breakthrough and crushed all the serial numbers, keygens, cracks, patches. Even if they worked just for a little while, users were prompted every minute reminding. Mar 12, 2019 Internet Download Manager (IDM) is a popular download manager for Windows. The only difference between IDM and other popular download managers is that IDM is a paid software which means that you need to buy it to use it. Here are some solutions which you may try before contacting the IDM support team. Tweaking IDM files. But the joy of those people remained short-lived when IDM introduced a new update to catch those people. After then, whenever a person opens IDM, it pops up with a message “IDM has been registered with a fake serial number” and if you try to cancel this message, the working of IDM stops automatically.