Please verify that the hash of the file you download is in checksums.txt and that checksums_signed.asc is a valid signature by that public keys of checksums.txt.
(so if you want backfill-2 branch for example, you'll have to build it yourself)
These releases are not always completely up to date with latest features, and are only released from master. Once Baritone is installed, look here for instructions on how to use it. You can also use a custom version json for Minecraft, with the 1.14.4 version or the 1.15.2 version or the 1.16.5 version. The easiest way to install Baritone is to install Impact, which comes with Baritone.