Copy "transmission-cli_2.92-r0.0_armhf.deb" from archive to the /tmp folder on your dreambox.
Install this via plugins menu on your dreambox, preferable to install this way rather than via SSH.
Restart Dreambox
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Copy folder "transmission-daemon" to your /etc folder on dreambox.
Copy contents of "/etc/systemd/system" to your /etc/systemd/system folder on your dreambox.
Restart your dreambox.
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Access Transmission now via web on your http://YourDreamboxIP:9091/
Tested working by myself on SatLodge, NewNigma2 and Merlin OE2.5 based images.