Hai,
Just reporting, the debian 9 kopano archiver package, contains the .deb package 2x.

tar -vxf archiver-8.6.80.722_0+83-Debian_9.0-amd64.tar.gz
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./kopano-archiver_8.6.80.722-0+83.1_amd64.deb
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./amd64/
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./amd64/kopano-archiver_8.6.80.722-0+83.1_amd64.deb
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./Packages
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./Packages.gz
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./Release
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./Release.gpg
archiver-8.6.80.722_0+83-Debian_9.0-amd64/./Release.key