Lupin III: The First is "out" (check Nyaa). The subs are translated from Portuguese and aren't that great, so might be worth waiting if your moonspeak isn't up to par, but for the most part they're adequate.
The plot is very much something you've seen 100 times before, but it was a fun movie. Visually it looks like a lower budget attempt to make a Pixar movie, but the animation is pretty good.
Would love to know when it is supposed to take place- I thought it was maybe the 60s, but at one point they eat Cup Noodles and that product came out in 1971.

For some reason, there were also some scenes that kept making me think of Metal Gear Solid 3 and 5. Jigen in this movie also kinda looks like Snake, lol.