Java Runtime Environment version 8 or higher

General Help
1

How can I start or install a program with the file extension .jar?
On Ubuntu, I just had to go to Properties and file

I also need Java Runtime Environment version 8 or higher for this.

How do I do this on Zorin 18?

2

The available in repository For Zorin OS 18 should meet your need:

sudo apt update && sudo apt install openjdk-8-jre

If properties > permissions > Allow executing as a program is not working, noes launching from terminal work (Replace program with the actual file name of that program)?

java -jar program.jar

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