Never seen a free one before … https://www.sonible.com/balancer/
https://youtu.be/-H3YngsYRBQ?t=82
It does work in Audacity 3.2.0 : it appears as “Focusrite” Balancer in RealTime effects menu.
The trick to applying the corrective EQ this plugin calculates, (which you can hear), to the audio
is to pause* the playback, then mix & render.
[ * pause, not stop. If you stop, the default settings are applied, which in this case is null].
Apparently the Balancer isn’t just adjusting the EQ : the stereo-image is being changed, (for the better)
What the “Universal” (generic) target EQ produces …
9dB bass boost is a bit much IMO, but still, it neutralizes the EQ, quickly, for free.
There are other target presets: Male voice, Female voice, Electric guitar, Acoustic guitar, etc.
No longer available
May you upload the plugin on any website, please?
Redistribution of their software is a no-no.