@old fox
Fefer fo following manul to check and install some files.
/editor/attached/file/20210111/20210111153446_9591.docx
Then restart the program.
If it still cannot work, uninstall the software and visit following address to reinstall it.
http://www.whitehatbox.com/SoftwareUpdate/Download/8e6fefb4-a285-4fd6-a6ea-98d7ab5e8bc5.zip
Let us know if it works.