1. Install JRE

Check JRE on your PC

First of all, check if JRE is already installed on your PC.
To do so, try to input in the terminal/CMD window as,

	$ java -version⮠		for Unix-like Platform (sh sytem)
	% java -version⮠		for Unix-like Platform (csh sytem)
	> java -version⮠		for Windows Platform

	java version "1.8.0_281"
	Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
	Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)

then you already have installed JRE.
If the version is 1.8.0 or newer, you can skip the processes below.
But in case of that you want to install a newer version of JRE, please continue the following.

If an error message is shown that the command was not found, or the displayed version is older than 1.8.0, then please follow the instructions below to install JRE.

Install JRE

JRE for PCs is available from Java page on ORACLE.
For JREs of other platforms, please contact the makers of your hardware and OS.

JDK (Java Development Kit) includes JRE.
Please use JRE of version 1.8.0 or newer.
Viivi does not run with JRE older than version 1.8.0.

Installation processes are different depending on the platforms and the JRE versions.
Follow the instructions of the JRE supplier and install JRE correctly.

You can repeat the same check as shown at the top of this page to see if JRE is installed correctly.