The latest version is at https://community.elgg.org/plugins/1592751/releases/3.2.3
You might want to leave a comment there with as much detail as possible.
You can get started with http://learn.elgg.org/en/latest/guides/upgrading.html
(Don't be alarmed that Elgg 2.0.0 is also mentioned there. The upgrade from 1.8 to 1.9 was quite a big one, but as you see, the others are much more simple.)
There aren't examples for each individual deprecated function. You can however take a look at the /engine/lib/deprecated-1.*.php files. Use the calls inside the old functions as examples of how the new functions should be used.
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