Hello!
I had some luck with “2017-11-25-Screenly_OSE_4GB” and later with a 2018 release. If I can relocate the exact URL I will send it later. It most likely came from Screenly · GitHub.
NOTE: I noticed a mistake I made a couple of times: once everything was installed and “mostly” working there were times the “active assets” (viewed from entering Pi IP address into browser) were visible but NOT in the active area --even though they were entered and chosen. Hmm?
UPDATE. Open https://github.com/Screenly/screenly-ose/releases/tag/v0.14 and scroll down. The “2018-01-19-Screenly_OSE_4GB” image is what works for me at the moment.