download latest dashcore-0.15.0.0-osx.dmg and SHA256SUMS.asc from https://github.com/dashpay/dash/releases
verify checksums match
cat SHA256SUMS.asc
shasum -a 256 dashcore-0.15.0.0-osx.dmg
installed to: /Users/ls/Library/Application Support/DashCore
Move the DashCore folder to external hard drive
Open DashCore executable in ./Applications/DashCore and choose the folder where it was store on the external hard drive