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If you  change the properties file then the signing will be broken, the signing must then be removed (META-INF\*.RSA and *.SF) or better resigned with your own certificate.

For making a fully standalone installer that also ships java your need to configure the above boostrap.jar correctly 

Then download an openjdk jre installation of Java 8 (Java 12 is also fine but that could result in configuring the vm arguments in later on to enable all features) here: https://adoptopenjdk.net/releases.html (this is the other platforms section of the main page)

Now you can click on a for example 64 bit of Jdk8 where you get the option to download just the JRE (as a zip)

create a directory that has in the root the bootstrap.jar

in that directory extract the jre.zip to a jre dir (if the zip already containts a parent dir, rename that directory to jre, so you have a jre\bin\java file.

create a batch/sh file for windows/mac that starts up the command:

jre\bin\javaw.exe -jar boostrap.jar