Known release family
Distribution records identify the 0.96.20 release family, including Debian package revision 0.96.20-9 and FreeBSD port revision 0.96.20_2.
FreshPorts records the source archive as Coccinella-0.96.20Src.tar.gz and lists GPLv3. That record is useful for provenance, but it does not make an old build suitable for daily use.
Independent package records
Debian Package Tracker ↗
Historic package metadata, versions, source links and removal status.
FreeBSD FreshPorts ↗
Port history, dependencies, license record and source checksum.
SourceForge project record ↗
Independent upstream project archive; availability may vary.
Why there is no download button
Software from this period can depend on retired libraries, obsolete encryption defaults and infrastructure that no longer exists. Republishing a binary without a security review would imply support this archive cannot provide.
Preservation decisionThe old
/download URL is kept relevant by documenting provenance and directing researchers to independent package records instead of serving an unverified executable.