After installation, open Chrome > extension > enable Developer Mode. Then find "IDMGCExt.crx" (without quotation) sa directory folder ng IDM then drag and drop mo sa Chrome while in the extension installation page.
Alternative way is to visit https://

chrome.google.

com/webstore/detail/idm-integration-module/ngpampappnmepgilojfohadhhmbhlaek/related (remove emoji) and install extension.
I try mo muna yung first method. Sa second method kasi official na IDM extension ma i-install mo baka hindi gumana yun sa cr@cked IDM.