Can't install MS 4.0.2 AppImage

./MuseScore-4.0.2.230651545-x86_64 install

i.e. prepend the "./"
This is always needed and ever since, unless the current directory is part of PATH

I found out (eventually) that the .\ is needed, along with the "install" suffix, having allowed the Appimage file to be run as an executable.

The application runs (and is wonderful).

However, I get a generic "cogwheel" icon in the Activities bar while Musescore 4.0.2 is open. With the "nightly" builds of 4.0 there was a nice Musescore icon.

I am running Ubuntu 22.04 and MuseScore-4.0.2.230651545-x86_64.AppImage

If anyone can decode the terminal error messages, I get the following after typing "./MuseScore-4.0.2.230651545-x86_64.AppImage install":

./MuseScore-4.0.2.230651545-x86_64.AppImage install
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.

(AppImageLauncher:14920): GLib-CRITICAL **: 22:20:42.771: g_file_test: assertion 'filename != NULL' failed

(AppImageLauncher:14920): GLib-CRITICAL **: 22:20:45.083: g_dir_read_name: assertion 'dir != NULL' failed

(AppImageLauncher:14920): GLib-CRITICAL **: 22:20:45.083: g_dir_close: assertion 'dir != NULL' failed

** (AppImageLauncher:14920): WARNING **: 22:20:45.088: No icons found in AppDir/usr/share/icons. Using .DirIcon as fallback

** (AppImageLauncher:14920): WARNING **: 22:20:45.089: Unable to move icon file from /tmp/libappimage-VO9Q51/.DirIcon to /home/****/.local/share/icons/hicolor/32x32/apps/appimagekit_fa921462c1c58b41d1577e9d82deaa53_mscore4portable.png
/lib/x86_64-linux-gnu/libjack.so.0
/lib/x86_64-linux-gnu/libnss3.so
Installation step 1 of 3.
PREFIX is '/home/****/.local'.
Preparing to install resources to:
PREFIX/share/applications/*
PREFIX/share/icons/*
PREFIX/share/man/*
PREFIX/share/mime/*
gtk-update-icon-cache: Cache file created successfully.
Resources installed to '/home/****/.local'.
Step 2 of 3.
MuseScore is at: /home/****/Applications/MuseScore-4.0.2.230651545-x86_64_fad3de9b129dfdf8ddca9d6b70d0e1a3.AppImage
Moving AppImage to 'PREFIX/bin'.
Finished installing MuseScore to /home/****/.local
Step 3 of 3.
Symlinks can be created to make it easier to launch MuseScore from

the command line. (Symlinks are like shortcuts or aliases.)

My username has been replaced by "****" for security reasons :-)