Kaellum runs on the original Ultima Online client. You install the client once, point it at our address, and make a character. Nothing to buy, no launcher to keep updated.
Download the free classic client package and unzip it anywhere — Program Files is best avoided. It does not need an EA account and does not touch an existing install.
Kaellum ships its own art and map files for the isle. Drop the patch folder into your client directory and let it overwrite when asked.
Open login.cfg in the client folder and replace its contents with the line on the right. Save, then run the client.
Type any username and password and the shard creates the account on first connect. Three characters per account. New arrivals land at the Verrin docks with a blessed kit and a hundred gold.
Almost always a missing patch file. Re-run the patch and confirm the overwrite; if it persists, delete client.exe.log and try again.
Your login.cfg still points elsewhere, or a firewall is holding port 2593. Check the line exactly as written above, no spaces.
Third-party clients work and are permitted. Use the same address and port. We do not support their bugs, but the Discord usually can.
Say so in the newcomers channel. There is a standing arrangement where a veteran walks new players through their first hour, and it costs nothing but the ask.