Since Raspberry OS is Debian-based, why you can't use the repositories? It even uses APT. (I'm don't know Raspberry Pi OS enough).

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I know it's an old subject, however, I was having the same issue and I found a solution. I'm making an article about KStars for my astronomy website ( AstrosigmaAstrosigma ), so I tried to do some screenshots.

Using Debian 9 Stretch, the KStars version is 2.6.0. A lof of buttons are missing, even in the main toolbar. I tried to fix it changing some long texts for abbreviatures. However, it was ugly. I tried to install some libraries about KDE and LXDE. I have to say I'm not using KDE, I'm using i3wm (it uses part of LXDE).

Moreover, I wanted the text buttons in Spanish ('cause my article will be for Spanish readers), but with my KStars default version was not even possible to change the language for the GUI.

Solution: install it via snap. Use the command `sudo apt-get install snap` to install snap, then install the core snap with `sudo snap install core`, and finally install KStars with the command `sudo snap install kstars`. You can now execute the new version with the command `snap run kstars`. It's the version 3.5.7 Stable.

PS. The language switcher was not working. I had to say the Spanish language to my computer with the command `sudo dpkg-reconfigure locales`.

And now I have the 3.5.7 Stable version in Spanish, without having to do a disto upgrade. Snap and AppImages are a very interesting way to install software.

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