If you have a ladder, it is best to go to the "Chrome Web Store" to download the extension. If you don't have a ladder, you can use someone else's packaged .crx extension. Here's how to export a Chrome extension (.crx):

1. Open the Chrome browser - More Tools - Extensions, or directly enter "chrome://extensions/" as shown in the screenshot below.

2. Enable Developer Mode in the upper right corner.

3. Get the extension ID. For example, the IDM Integration Module has an ID of "ngpampappnmepgilojfohadhhmbhlaek". Take note of the ID and then click "Pack extension".

4. You can directly use Everything to search for the ID to find the specific directory of the extension. Open the directory and copy the path.

5. Go back to "Pack extension" and enter the full path of the extension. Click "OK" and it will prompt you with the export path of the .crx extension.

To install a Chrome extension (.crx):

If you have a ladder, just search and install it directly from the Chrome Web Store. If you don't have a ladder, you can install someone else's exported .crx extension. You need to switch to the Extensions page first. Enter "chrome://extensions/" in the Chrome browser to open it (this is important, it must be on the Extensions page, otherwise you won't be able to install it). Then, simply drag and drop the .crx file onto this page.

In summary, this method allows you to share Chrome extensions exported to those who don't have a ladder, but there may be issues such as the extension not being updated in a timely manner and the risk of downloading malicious extensions provided by others. Use with caution.