A new PDF update (October 2023) of the generic Argad rules (a mix of skirmish wargame and RPG) is available in English (and is always free).
The rules were first published in 1996 ...and have improved since.
The previous version of the generic rules was made in 2020.This new update keeps the same presentation and pagination and does not change the overall system; a few things are better explained, some points outdated by recent extensions are improved, suggestions of optional rules have been corrected.
Direct link:
http://www.argad-bzh.fr/argad/pdfs/argad-en.pdf
Everything else, and links to some interesting AARs, here:
http://www.argad-bzh.fr/argad/en.html
The same update in French (September 2023) is here:
http://www.argad-bzh.fr/argad/index.html