IF you are not able to adjust your Linux Mint installation, so the current, up-to-date, compatible Linux Mint installer for Brave Browser, will work . . . THEN:
You probably have an Early 2015 MacBook Air:
https://everymac.com/systems/apple/macbook-air/specs/macbook-air-core-i5-1.6-13-early-2015-specs.html
That is a 64-bit machine, that could also handle 32-bit software.
The latest 64-bit compatible version of MacOS: 12.7.6 “Monterey”
The latest 32-bit compatible version of MacOS: 10.14 “Mojave”
Changes to macOS desktop browser requirements
https://support.brave.com/hc/en-us/articles/18347246446733-Changes-to-macOS-desktop-browser-requirements
Means . . .
For older Mac computers and MacOS - compatible Brave Browser installers:
MacOS 10.15 Catalina (10.13 High Sierra, 10.14 Mojave):
https://github.com/brave/brave-browser/releases/tag/v1.69.168
MacOS 10.12 Sierra:
https://github.com/brave/brave-browser/releases/tag/v1.41.100
And, probably you would need to use:
The Brave Browser (at GitHub) archive for old installers:
https://github.com/brave/brave-browser/blob/master/CHANGELOG_DESKTOP_ARCHIVE.md
. . . and there, search for older, 32-bit/64-bit compatible Linux installers.
PS. From scratch, I would have:
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Followed the procedures to install MacOS, and then Bootcamp, on the computer.
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Installed Linux Mint on the Bootcamp volume.