Hi Sid,
Your version is way past EOL. You should upgrade to either the latest version or the current LTS immediately. Your upgrade path is:
6.5 → 6.7.7 → 7.9.6 → 8.9.2 → 9.0.1 (last step optional)
I know you said you can’t upgrade, but there is less than no support for your version. TypeScript analysis is not available and it will not be made available. And in the meantime, you’re missing many, many bug fixes, vulnerability patches, general improvements and functionality additions.
You mentioned having projects that are “dependent” on 6.5. Could you describe that dependency?
Ann