Your default .deb package tries to install these packages as dependencies and fails.
While libasound2t64 and libglib2.0-0t64 are experimental or testing packages which won't install on normal systems, libjpeg-turbo8 doesn't exist at all (or is possibly hopelessly outdated so it even doesn't show up in the package listings of oldoldstable).
This renders it impossible to install your program on stable debian. Please check yourself on a default debian 12 (bookworm) stable.
How to fix or work around this? Does your program only work on Ubuntu? Please clean up.
I would suggest for now downloading the version 1.9.3 .deb You can find it in the Files folder here.
The other workaround if you do want 1.9.8 :
Download the tar.gz version of ProjectLibre instead of the .deb.
Manually extract and run the executable from the terminal using java -jar.
Ensure you have Java 11+ installed (openjdk-11-jre works well on Debian Bookworm).
Many thanks! The recommended workaround with the .tar.gz instead of .deb works on debian 12 bookworm stable (and derivates). Single issue left was a java version mismatch. I had openjdk-17-jre installed, which still was not enough. Not sure how java 11 which you had stated should have worked then:
Java 17 is the latest Java available from debian 12 (bookworm) stable, so I had to manually download and install java 21 from Oracle, which brings the expected class file version 65.0 of your main.
With this java version ProjectLibre finally comes up on debian 12
Side note: Would be great if you could provide stronger checksums like sha256 or sha512 instead of sha1 and md5 only for the tar.gz and .deb package download.