Broken links in Pdf4Qt App Launcher on Zorin

Hi I’m new here having installed Zorin17.2 (like debian /ubuntu22.04) with Flatpack installed as default.

Launched Pdf4Qt from flatpack and the open button opens the PDF4QT Editor.

I ‘Pinned’ the Launch icon to the taskbar ok.
When (with the writer app is closed) I click the Launch Icon, the Launcher opens, offering the 4 options:-
Editor.
Viewer,
Diff.
and PageMaster

When I click on any of those 4 icons I get
"Error failed to start process ‘./Pdf4QtEditor’ # for example

As the error mentions a ./filename I have searched

root@p4zn:~# find / -name 'Pdf4Qt*'
find: ‘/proc/11391/task/11391/net’: Invalid argument
find: ‘/proc/11391/net’: Invalid argument
find: ‘/run/user/1000/gvfs’: Permission denied
find: ‘/run/user/1000/doc’: Permission denied
/var/lib/flatpak/.removed/io.github.JakubMelka.Pdf4qt-075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtPageMaster
/var/lib/flatpak/.removed/io.github.JakubMelka.Pdf4qt-075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtEditor
/var/lib/flatpak/.removed/io.github.JakubMelka.Pdf4qt-075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtLaunchPad
/var/lib/flatpak/.removed/io.github.JakubMelka.Pdf4qt-075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtViewer
/var/lib/flatpak/.removed/io.github.JakubMelka.Pdf4qt-075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtDiff
/var/lib/flatpak/app/io.github.JakubMelka.Pdf4qt/x86_64/stable/075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtPageMaster
/var/lib/flatpak/app/io.github.JakubMelka.Pdf4qt/x86_64/stable/075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtEditor
/var/lib/flatpak/app/io.github.JakubMelka.Pdf4qt/x86_64/stable/075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtLaunchPad
/var/lib/flatpak/app/io.github.JakubMelka.Pdf4qt/x86_64/stable/075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtViewer
/var/lib/flatpak/app/io.github.JakubMelka.Pdf4qt/x86_64/stable/075b7cfa6c037b7cbf4ffe70f2f309544e43da101bea178c5705eae2075c2d2d/files/bin/Pdf4QtDiff
root@p4zn:~# 

The removed files are from a previously removed install - trying to solve this.

ANY IDEAS ? or should this be posted in the Pdf4Qt App git site. THANKS