Okay… solved it the “Nerd way”.
Extracted deb-package and edited DEBIAN/control file to add the missing dependency for “libssl1.0.0”
dpkg-deb -R cav-linux_1.0.220659-32_amd64.deb cav-linux_1.0.220659-32_amd64/
nano cav-linux_1.0.220659-32_amd64/DEBIAN/control
dpkg-deb -b cav-linux_1.0.220659-32_amd64/ cav-linux_1.0.220659-32_amd64_libssl1.0.0.deb
This has been patched in line “Depends:”
-- libssl0.9.8 (>= 0.9.8m-1) ++ libssl0.9.8 (>= 0.9.8m-1) | libssl1.0.0
After repack install and it seems to work so far!