Modern browsers block extensions from running on all sites by default.
: Update your IDM software. Open IDM, click Help in the top menu, and select Check for updates . Modern versions of IDM use the Chrome Web Store format to bypass this issue. 2. IDM Extension is Greyed Out or Corrupted idmgcext.crx
The file is typically located at: C:\Program Files (x86)\Internet Download Manager\IDMGCExt.crx . It comes bundled with the IDM installation package, so you don't need to download it separately from third-party websites. Simply installing IDM automatically places this file in your IDM installation directory. Modern browsers block extensions from running on all
If your local CRX file is corrupted, you can bypass it entirely by downloading the extension directly from the official store. Modern versions of IDM use the Chrome Web
Last updated: October 2025. Information is accurate for Internet Download Manager version 6.42 and Chromium browsers version 120+.