From your error message you are looking for liblber its part of the libldap package. If your games are 64bit you would install libldap, if they are 32bit you would need to install lib32-libldap. But the issue is its looking for a specific version, 2.4 while the package in the repos is 2.6 and not named the same. You could try and install the package and then create a named symlink, but there are no guarantees this will work, still its worth a shot.
the command will be different depending on if its 64 or 32 bit. Open a terminal and issue one of the commands after installing the libdap or lib32-libdap.
64bit sudo ln -s /usr/lib/liblber.so.2.0.200 /usr/lib/liblber-2.4.so.2
Lastly, if it does work, and the libldap package is upgraded in the future, the name of the liblber.so.2.0.200 file may change. If that happens you will get the error again. To fix it, you will need to remove the broken liblber-2.4.so.2 symlink, find out the name change, edit the command to match the name and execute the command.
Getting old games to run can be tricky. Since I love old games I found the symlink/renaming trick a few years back. Keep it in mind when trying to get old games working on Manjaro or any other Arch based distro. Since they are rolling releases package upgrades come at a fast pace. Also please mark the thread solved so other people helping know the problem is gone and can focus on helping others.