Currently the only way to install a recent version of SiriL on the RPi is building from source. It’s not completely evident, neither extremely difficult

This are the steps I’ve followed (I think, that nothing is missing)

sudo apt install -y libgtk-3-dev libconfig-dev libfftw3-dev libexiv2-dev libopencv-dev libraw-dev libffms2-dev libheif-dev libcurl4-gnutls-dev gnuplot cmake libgsl-dev ninja-build libcurl4-openssl-dev

sudo pip3 install meson==0.54.2

git clone https://gitlab.com/free-astro/siril.git 

cd siril
git submodule sync --recursive
git submodule update --init --recursive 

meson --buildtype release _build 
ninja -C _build
sudo ninja -C _build install

Perhaps the meson version now must be other. When you run the meson step it will tell you if you need a more recent version.

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