Have a easy way to download versions of bondi

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Have it so insted then looking for the version you want to install on the github have it so you run a script in the terminal and then that script will download versions of Bondi for you in a sub dir as long as if they are already downloaded a way to uninstall or launch and compile them with out needing the terminal have it so it does not use a local file to get all the installer commands to run in terminal but it talks with a github file and then that file tells the script everything it is going to need. Also have it so when you frist run the script have it look for he javac and java comands in one is not found have a error show up saying "No java found make sure both 1) java 2) javac are installed." and then have two buttons one to close the app and one that takes you to the java jdk 17 download page.