Unisync should be installed both locally and remotely. You will then run the local copy, and it'll connect to the remote copy. Please select your Operating System above to see installation instructions for it. For example, if you're on a Mac laptop connecting to a Linux VPS, you would follow the Mac instructions for your laptop, and then SSH into your VPS and follow the Linux instructions to install it there.
curl -L -o unisync unisync.sh/download/openbsd chmod a+x unisync
On the local side, unisync should go into a folder in your PATH (this is optional but recommended for convenience).
sudo mv unisync /usr/local/bin/
On the remote side, unisync should go into ~/.unisync/ within your home folder. This is our standard because you might not have root on your remote machine (such as within a shared hosting environment). If you do have root, feel free to put it in a system PATH folder like /usr/local/bin. If you've set up your own PATH folder like ~/bin, that will work, too.
mkdir -p ~/.unisync mv unisync ~/.unisync/