Start with the 1080p version with Spanish subtitles. It is the most “verified” in terms of quality and completeness. If you need a pure dub, use the search terms above and always preview the last 10 minutes to confirm the audio doesn’t cut off.
When users say “verified” in this context, they usually mean: Start with the 1080p version with Spanish subtitles
The film is in the due to a failure to renew its copyright in 1970s. However, it is not in the public domain in many other countries (including Spain and much of Latin America, where copyright lasts for 70+ years after Chaplin’s death in 1977, i.e., until 2048+). This legal nuance affects what you find on the Internet Archive. Start with the 1080p version with Spanish subtitles