# Install BSF4ooRexx on macOS 64-bit

Java is a prerequisite for installing BSF4ooRexx. Java's and ooRexx's bitness must match (i.e. both must be 32 bit or both must be 64 bit)

First, check if you have Java installed already.

- Open a terminal window (how?)
- Enter "java -version"
- If the output contains information about your Java version, Java is installed. If the information contains "64-Bit", you have Java 64-bit installed. If it does not, you have Java 32-bit installed. If the output does not contain information about your Java version, Java is not installed

If Java 64-bit is installed, go to section BSF4ooRexx.

If Java 32-bit is installed or Java is not installed at all, install Java 64-bit now (see steps below).

## Java 64-bit

Install Java

1. Download Java 64-bit (http://www.google.com/search?q=download Java 64 bit mac)
2. Install Java (double click the downloaded file)

## BSF4ooRexx

Java should be installed now. Continue here