Go to Download on the CIGALE website and download the tarball from the link, say the version 2025.0.
You can use wget to do this.
wget https://gitlab.lam.fr/cigale/cigale/-/archive/v2025.0/cigale-v2025.0.tar.gz
tar zvf cigale-v2025.0.tar.gz
cd cigale-v2025.0
uv tool install --python 3.12 "pcigale@."
This installs CIGALE in ~/.local/share/uv/tools/pcigale/. The executables, pcigale, pcigale-filters, and pcigale-plots are symlinked under ~/.local/bin/.