[NiteWave]

Had to restart, then uninstall, then reinstall lsws.

sorry, have cause so much trouble with you.

I assume you're not familiar with litespeed's version management feature.

it's
admin console->
Actions->
Version Manager

you can install multiple version litespeed on your sever, and switch between them by just one click in above page. and usually has 0 downtime.
in your case, you can install 4.0.20, 4.1RC4, 4.1Rc5 and switch between them without worrying about downtime.

what version you tried, 4.1RC4 or RC5 ?