NO JOY Failed 3cx installation

[Lou Smith]

We've been trying to get 3cx working on an OVH server and initially followed Ward's recommendations in: http://nerdvittles.com/?p=22374 as follows:

wget -O- http://downloads.3cx.com/downloads/3cxpbx/public.key | apt-key add -
echo "deb http://downloads.3cx.com/downloads/3cxpbx/ /" | tee /etc/apt/sources.list.d/3cxpbx.list
apt-get update
apt-get install 3cxpbx

For some reason, it didn't work and my tech found success using the following installation commands:

1. wget -O- http://downloads.3cx.com/downloads/3cxpbx/public.key | apt-key add -
   echo "deb http://downloads.3cx.com/downloads/debian stretch main" | tee /etc/apt/sources.list.d/3cxpbx.list
   apt-get update
   apt-get install libcurl3=7.38.0-4+deb8u5
   apt-get install 3cxpbx

However, when she started to implement TM3, we could no longer log into the server and she detailed that in my post https://pbxinaflash.com/community/threads/login-fail-server-error-502-bad-gateway.22238/

If you see anything obvious that we're doing wrong, I would really appreciate pointing it out because we've been at this for several days with no great amount of joy.