This is not a direct solution but is helpful when other options are not working. Related: Chrome blocking downloads with Network failed error.
Turn off installed extensions one by one and check if you are able to download the images. If this problem is occurring because of some extension installed on your Chrome browser, then check if you are able to download images after turning off that particular extension.
After this, relaunch the Chrome browser, and now you should be able to download images using Chrome browser. Now, wait until the Chrome browser clears the selected options.
However, some users have complained that they can’t download or save images from Google Chrome. Like any other browser, Google Chrome also provides the option to download or save images from Google Image search results and other sites.