Choose file > export data > Unsecured archive (readable) in CSV Format
Dashlane stores the value between quotes (“”), so open the CSV-file on Notepad (Win) or Textedit (Mac).
Make sure that you delete all the quotes (“) in the file by using search and replace.
Hypervault needs headers, so add the following on the first line: site, sitename, email,loginname,password
It is possible that you need to move the content from cells to another column, so check that the value in a cell belongs to the right column. This requires some manual work, but will leave you free from uploading mistakes in a later step.