"Apocalypse Now: Redux" (1979)
https://gomovies.to/film/apocalypse-now-redux-19582/watching.html?ep=590497 - Large player, HD, best choice. 3:16:09
https://gomovies.to/film/apocalypse-now-6743/watching.html?ep=74126 - Same site, large player, HD, just mistaken for the theatrical cut. Good choice if the above doesn't work. 3:16:03
http://putlocker.ac/watch-apocalypse-now-online-free-1979-putlocker.html - Smaller player, HD. 3:16:09
http://ffilms.org/apocalypse-now-1979/ - Smaller player, HD. 3:16:03
Alternative links if the above don't work - http://www.primewire.ag/watch-863-Apocalypse-Now-online-free - Be sure to check movie length to ensure you've got the right version