They are not available as far as I can tell. If memory serves me well, the current kirby repo had a different name during v3 development and the code for v2 was

They are not available as far as I can tell. If memory serves me well, the current kirby repo had a different name during v3 development and the code for v2 was living in another repo also named kirby. When v3 went live they renamed the two so that v3 became the kirby repo currently online and the old one became kirby-v2 or something like that. And that repo has now being archived apparently.