found this for getting Beta Titan:
"How to install the beta version?
1) Download the zipfile for my beta repository
https://github.com/marcelveldt/repositor...-1.0.1.zip
2) In Kodi, go to settings --> Add-ons --> Install from zipfile --> select the downloaded zip.
3) After installing the repo, "Marcelveldts beta repo" will be listed at the available repo locations in Kodi. Note that sometimes it can take a while before the repo actually lists any content because Kodi updates the content of the repo in the background. To speed up this process you can either restart Kodi or press the "Check for updates" button in the left sidebar menu.
4) While still in Kodi-settings-addons, Go to "Install from repository". Select the "Marcelveldt's beta repo" repository.
5) Select the Look and feel --> skin section. Select the Titan BETA skin. "
My problem is I'm using the Amazon Firestick, and can't figure out how to add marcelveldt repository as a Source...keeps showing up empty when I try to get something from it...have used "http://github/marcelveldt/" and "http://github/marcelveldt"...what should firestick users be inputting as source?