Apparently, the requirements are already installed:
Reading package lists... Done
Building dependency tree
Reading status information... Done libmpv1 is already the latest version (0.27.2-1ubuntu1).
libmpv1 installed to install manually. libxapp1 is already the latest version (1.0.4-2fakesync1).
libxapp1 installed to install manually. python3-imdbpy is already the latest version (6.8-2).
The following packages were installed automatically and are no longer available:
gnome-tweak-tool python3-click python3-colorama
Use 'sudo apt autoremove' for OS remover. 0 signed packages, 0 new packages installed, 0 to be removed and 1 unsigned.
However, I cannot run the application and Terminal displays the same error message.
Yes, I do. But it took me a while to be able to backup and migrate from Windows to Z15.3. Maybe, I will use this version until they implement a direct upgrade.
I don't know how much you need to backup, but Mega have Free 25GB storage in the cloud and it's fully compatible with Zorin (ubuntu) and integrate well.
Double click to run the installer after you save the file.
Otherwise, I am sure we can help you get set up in Zorin OS 16. The Direct Upgrade path is actually more painful than a regular reinstallation.
Such as this post here: