ClassicPress is WordPress 4.9, but with Long Term Support ( LTS ) by the community.
Your .htaccess settings should work right out of the box, unless you have edited them in a way that need slight modification, but I honestly doubt you need to do so.
The future is bright.
The project is quite active behind the scenes; we like working in incognito mode without making a fuss.
Feel free to join our Slack channel(s).