If you have problem updating LiteSpeed WebServer through control panel (like cPanel, DirectAdmin) you can do it from the terminal.
1. Login to your server through ssh.
2. Remove files in the directory /dev/shm/lsws with the command:
rm -rf /dev/shm/lsws
3. Update Litespeed Webserver to the latest version with command:
/usr/local/lsws/admin/misc/lsup.sh -f -v <version number>
You can get version number from this page ( https://www.litespeedtech.com/products/litespeed-web-server/release-log ).
For example:
/usr/local/lsws/admin/misc/lsup.sh -f -v 5.2.4