Thank you for your continuing replies, Zurga. However, I have not succeeded in launching the application and there is no ancestris or .ancestris folder in the Genealogy folder in which I placed the downloaded file nor in the Applications Support folder. Not anywhere on the drive. Attempting to launch the application is halted before any files or folders are written to the drive.
As noted earlier, I have a properly installed Java installation:
openjdk 11.0.10 2021-01-19
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.10+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.10+9, mixed mode)