32bit version is only required for mods (SilEnT, n!tmod, Jaymod, NoQuarter, ...). But if you want to make waypoints, it is much easier to install 64bit ET:Legacy, because it does not depend on any packages or libraries. The 64bit ET:Legacy works on many 64bit Linux distros. I tested it on Ubuntu and Debian.
Your et_powescape waypoints are for old Omni-bot 0.8. You should update Omni-bot to version 0.9.