The film has not been widely available on global services like Netflix or Disney+ outside of French-speaking territories. English subtitles are available on some platforms (Amazon, Apple).
Unlike some films, Kaamelott – Premier Volet was released in a single "intégrale" version. However, Astier famously shot over 4 hours of footage. The 2-hour theatrical cut is the only official "Livre 1."
The year is critical because the film’s availability changed dramatically:
These videos are often geo-blocked in France due to broadcasting rights but can be accessed from other countries or by using a VPN. Kaamelott: Premier Volet (2021 Movie)
While I can’t provide direct streaming links, here is a concise, interesting write-up that captures the film’s significance, which you can use to persuade yourself or others to watch the 2021 Livre I in its integral form.