Solution:
1. Uninstall the installed Baidu Cloud Manager. Download and install the latest version of Baidu Cloud Manager again (official);
2. If you are using IE browser, you should have the following pop-up prompts. Click Allow to call Baidu Cloud Manager.
Sample screenshot
3. If you are using a browser with chrome core or other cores, the web disk page will have corresponding icons. Click "Plug-ins on pan.baidu.com are always allowed" and you should be able to call Baidu Cloud Manager.
Sample screenshot
4. If the above method 1-3 is adopted, it will not be solved. You can directly open and run Baidu Cloud Manager, select the network disk file (folder) to be downloaded from the network disk file list of Baidu Cloud Manager, and click the "Download" button to directly download the file (folder) in your own Baidu network disk using Baidu Cloud Manager.