"Ask4pc" is a popular website known for distributing cracked versions of paid software, including Internet Download Manager. The version of IDM found on this site is typically a "cracked" iteration. This means the original software files have been modified to bypass the serial key verification process, allowing users to run the program without purchasing a license from the official developer, Tonec Inc.
If you are following an Ask4PC guide, you likely want to install IDM correctly. Here is the standard, safe method recommended by most experts on the platform. ask4pc idm