[exuszero]

Runemate cannot be used with the RuneScape client from Steam or launched through the Jagex Launcher. If you are using one of these, or unsure if you are, please uninstall the client you currently have and reinstall the standard client from the official download page. I have the OSRS RS client from the download page, NOT the Jagex launcher or Steam

 

[american express]

Does this happen if you launch the OSRS client first, and then try to bind with it from within RuneMate?

Or what about if you try launching an OSRS client from within RuneMate?

Either way, post your log files. RuneMate client: Help > View Logs

 

[cuppajava]

You can also potentially try using Runelite if you aren't already @exuszero