Transferring brushes from Painter2018 OS Yosemite to Painter 2021 BigSur

Hello, Can anyone advise how to transfer 3rd party brushes ( i.e. not Corel brushes ) from my Painter 2018 which I have on my old laptop running OS Yosemite to Painter 2021 on my new laptop which runs OS BigSur?

Sheila