Hi!
I think that your question is related to this other question you asked: Java 7 support drop dates
For now the only major difference between the Java7 and the Java8 agent versions is the log4j2 version that is shipped with it.
Some security scanning tools mis-report the Java 7 version as vulnerable due to having an older Log4j2 version, see here for details.
The latest version of the Java8 agent can be downloaded from maven central here: Central Repository: co/elastic/apm/elastic-apm-agent-java8/1.45.0