The commands to install them should look like below, replacing the version numbers with the right ones and replacing [_ARCHITECTURE_] with the architecture of your computer. Run them in the root directory of this repository:
mkdir src-tauri/bins
cargo install --version 0.3.0 lair_keystore
LAIR_PATH=$(which lair-keystore)
cp $LAIR_PATH src-tauri/bins/lair-keystore-v0.3.0-[_ARCHITECTURE_]
cargo install holochain --version holochain-v0.2.3-beta-rc.1 --locked --features sqlite-encrypted
HOLOCHAIN_PATH=$(which holochain)
cp $HOLOCHAIN_PATH src-tauri/bins/holochain-v0.2.3-beta-rc.1-[_ARCHITECTURE_]
[_ARCHITECTURE_] is x86_64-apple-darwin on an x86 macOS, aarch64-apple-darwin on an Arm/M1 macOS and unknown-linux-gnu on Linux.
You can also find it out by running the command rustc -vV | sed -n 's/^.*host: \(.*\)*$/\1/p'.
cargo install --version 0.3.0 lair_keystore
$LkPath = Get-Command lair-keystore | Select-Object -ExpandProperty Definition
Copy-Item $LkPath -Destination src-tauri/bins/lair-keystore-v0.3.0-x86_64-pc-windows-msvc.exe
cargo install holochain --version holochain-v0.2.3-beta-rc.1 --locked --features sqlite-encrypted
$HcPath = Get-Command holochain | Select-Object -ExpandProperty Definition
Copy-Item $HcPath -Destination src-tauri/bins/holochain-v0.2.3-beta-rc.1-x86_64-pc-windows-msvc.exe