Simply uninstalled the version I had and donwloaded one of your pets and, since the dependencies were already there it worked fine. I was able to get smpayer working in Fossa. Should have read the responses to his post more carefully. I suspect that I ran into the same problem +Me ran into. Under VanillaDpup64 and Void64, they can't. Under Bionicpup and Fossapup 'ubuntu' libraries satisfied smtube's QT5 dependencies. The other is that while often libraries compiled under one OS will function under a different OS sometimes they won't. Slackware (and consequently Slacko under which and for which you created smtube) and debian/ubuntu locate 64-bit libraries in different folders. I had hoped that structure would avoid 2 problems. LD_LIBRARY_PATH=$LAUNCHDIR/:$LAUNCHDIR/extralibs$ '$LAUNCHDIR/smtube' last 2 lines displayed are actually one line in the script. There are two ways to handle that: (1) the libraries can either be installed into each Puppy or (2) as fredx181 showed with Portable firefox, an 'extralib' folder can be created within the application's folder and the application started with a script containing instructions such as this:

But to get either version of smtube to work required installation into those Puppys of libraries, primarily QT5s. Downloaded smtube-20.6 and it works as well from those Puppys. But the version doesn't make any difference. I already had smtube-20.1 set up as a portable which I could use with Bionicpup64 and Fossapup64. Running several Puppys it makes more sense for me to use ONE portable (accessed by all) than install the same application (or a version thereof) into each Puppy.

Instal the new for ios SMPlayer 23.6.0