Upon reading
http://trinity-users.pearsoncomputing.net/?0::11302
after filing this I was able to use 
https://software.opensuse.org/search
to locate and download
libaudio2-1.9.3-2.1.x86_64.rpm &
libIlmImf-2_2-22-2.2.0-11.1.x86_64.rpm from
http://download.opensuse.org/repositories/home:/
and install them with rpm. That and zypper installing
trinity-gtk3-tqt-engine
seems to have provided a full fix for TDE sessions on 42.1 host k8mmv.

http://lists.links2linux.de/pipermail/packman/2017-June/015273.html reports what to do about this. I tried on host big41 another installation according to what I reported in comment 1, and found too many dependencies to succeed.

Hello, I've rebuilt all Opensuse 42.2 packages in a clean build environment, to avoid missing dependencies.
The packages will appear on the mirrors in ~48h.

Happening again in 42.3:
trinity-tdelibs requires obsolete/retired libHalf22 from Packman replaced by libHalf23

Clean installation to fresh openSUSE 42.3 impossible due to dependency provided by neither openSUSE repos nor TDE repos.

Comment 4 has a typo. trinity-tdelibs requires libHalf12, not libHalf22. Packman only has libHalf23, which I installed, then installed trinity packages "broken" by absence of libHalf12. So far, all of TDE I've used works having only libHalf23 installed.

Hello, I've rebuilt the following packages with 'libHalf23':
- tdelibs
- tdebase
- tdegraphics
- libksquirrel
- koffice

After the mirrors are synchronized, you should be able to update the packages using 'zypper dup'.

Problem: nothing provides libIlmImf-Imf_2_1.so.21()(64bit) needed by trinity-tdelibs-14.0.4-1.oss423.x86_64

Hello Felix, I manage to install all TDE packages on a fresh opensuse 42.3 installation.

Here is the package you are looking for:

# rpm -qf /usr/lib64/libIlmImf-Imf_2_1.so.21
libIlmImf-Imf_2_1-21-2.1.0-10.3.1.x86_64

# rpm -qi libIlmImf-Imf_2_1-21-2.1.0-10.3.1.x86_64 
Name        : libIlmImf-Imf_2_1-21
Version     : 2.1.0
Release     : 10.3.1
Architecture: x86_64
Install Date: Fri May 11 18:59:59 2018
Group       : Development/Libraries/C and C++
Size        : 1142561
License     : BSD-3-Clause
Signature   : RSA/SHA256, Fri Mar  2 11:08:51 2018, Key ID b88b2fd43dbdc284
Source RPM  : openexr-2.1.0-10.3.1.src.rpm
Build Date  : Fri Mar  2 11:08:34 2018
Build Host  : lamb10
Relocations : (not relocatable)
Packager    : http://bugs.opensuse.org
Vendor      : openSUSE
URL         : http://www.openexr.com/
Summary     : Library to Handle EXR Pictures in 16-Bit Floating-Point Format
Description :
OpenEXR is a high dynamic-range (HDR) image file format developed by
Industrial Light & Magic for use in computer imaging applications.

This package contains shared library libIlmImf
Distribution: openSUSE Leap 42.3

(In reply to Francois Andriot from comment #8)
> Here is the package you are looking for:
> 
> # rpm -qf /usr/lib64/libIlmImf-Imf_2_1.so.21
> libIlmImf-Imf_2_1-21-2.1.0-10.3.1.x86_64
> 
> # rpm -qi libIlmImf-Imf_2_1-21-2.1.0-10.3.1.x86_64 
> Name        : libIlmImf-Imf_2_1-21
> Version     : 2.1.0
> Release     : 10.3.1
> Architecture: x86_64
> Install Date: Fri May 11 18:59:59 2018

I see it now, and don't understand why zypper couldn't find it 70 minutes ago.

What I actually want is the whole set of 15.0 packages. Is there a set of 14.0.5 rather than 14.0.4 for 15.0? There are only 14 days left to test 15.0RC until it is released.

Problem: nothing provides libHalf.so.12()(64bit) needed by trinity-tdelibs-14.0.4-1.osstw.x86_64. TW OSS provides 23-2.2.1-1.1.

This is strange, here when I download trinity-tdelibs from official repo, it requires 'libHalf.so.23()(64bit)', not the '.12'.

# grep RETT /etc/os-release
  PRETTY_NAME="openSUSE Tumbleweed" # 20180702
# zypper se -s libIlm | egrep -v 'debug|32bit'
i  | libIlmImf-2_2-22              | package | 2.2.0-2.1 | x86_64 | (System Packages)
v  | libIlmImf-2_2-23              | package | 2.2.1-1.2 | i586   | OSS
i+ | libIlmImf-2_2-23              | package | 2.2.1-1.2 | x86_64 | OSS
   | libIlmImfUtil-2_2-23          | package | 2.2.1-1.2 | i586   | OSS
   | libIlmImfUtil-2_2-23          | package | 2.2.1-1.2 | x86_64 | OSS
i  | libIlmThread-2_2-12           | package | 2.2.0-4.2 | x86_64 | Packman
v  | libIlmThread-2_2-23           | package | 2.2.1-1.2 | i586   | OSS
i  | libIlmThread-2_2-23           | package | 2.2.1-1.2 | x86_64 | OSS
# zypper --no-refresh se -si | grep 'tem Pac' | egrep -v 'plication|kernel|monitor-edid|fbset|grub|libdvdcss2'
i  | libIlmImf-2_2-22                         | package     | 2.2.0-2.1                     | x86_64 | (System Packages)
i  | libidn11                                 | package     | 1.33-3.4                      | x86_64 | (System Packages)
i  | libjasper1                               | package     | 1.900.14-8.2                  | x86_64 | (System Packages)
# zypper rm libIlmThread-2_2-12
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following 39 packages are going to be REMOVED:
  libIlmImf-2_2-22 libIlmThread-2_2-12 trinity-gtk-qt-engine trinity-gtk3-tqt-engine trinity-kappfinder trinity-kate
  trinity-kcontrol trinity-kdesktop trinity-kfind trinity-khelpcenter trinity-kicker trinity-klipper trinity-kmenuedit trinity-kmix
  trinity-konqueror trinity-konqueror-nsplugins trinity-konsole trinity-kpager trinity-kpersonalizer trinity-ksmserver
  trinity-ksplash trinity-ksysguard trinity-ktip trinity-kwrite trinity-libkateinterfaces trinity-libkcddb trinity-libkonq
  trinity-tdebase trinity-tdebase-bin trinity-tdebase-libtqt3-integration trinity-tdebase-tdeio-pim-plugins
  trinity-tdebase-tdeio-plugins trinity-tdebase-tdeio-smb-plugin trinity-tdelibs trinity-tdemultimedia-tdeio-plugins
  trinity-tdepasswd trinity-tdeprint trinity-tdm trinity-twin

  39 packages to remove.
  After the operation, 102.8 MiB will be freed.
  Continue? [y/n/...? shows all options] (y): n