All needed libraries should be bundled in zip (except ffmpeg which you need download and unpack to location with `czkawka_gui.exe` - https://ffmpeg.org/download.html#build-windows)
You can also install the app via msys2 (webp and heif should work here) - https://www.msys2.org/#installation (czkawka package - https://packages.msys2.org/base/mingw-w64-czkawka)
Compiling the gui is harder than compiling cli or core, because it uses gtk4 which is written in C and also requires a lot build and runtime dependencies.
Currently, there is are no instructions on how to compile the app on Windows natively.</br>
You can check for CI for instructions how to cross-compile the app from linux to windows (uses prebuilt docker image) - [CI Instructions](../.github/workflows/windows.yml)</br>
There exists a mingw recipe which you can try to convert for your purposes - https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-czkawka/PKGBUILD
- or this workaround: [#867#issuecomment-1416761308](https://github.com/qarmin/czkawka/issues/863#issuecomment-1416761308) (modify windows DPI settings for this app (this works too but the text is a bit blurry)).