You can convert any file from a version of Heredis for Mac or Heredis for Windows later than Heredis 2015.
To convert your file, open Heredis on its home page. If you see your file in the list of recent files, just click on it to start its conversion:
Note: The version of the screenshots below may differ from yours, but the content of the article applies to your version as well.
If your file does not appear in the recent files, you can find it easily. In the "Open" section, check that the "Heredis file" category is displayed and click on OK.
A window appears. It allows you to navigate in your Finder to the location of your genealogy file. Select the file to convert and click on Open.
The software will then start its conversion and open it once it is finished.