Installation of Brave 0.56.14 Linux Mint 'Betsy'

[Mattches]

Apologies, I must have closed it prematurely.

You’re probably running into a Linux sandboxing issue, in which case you’ll want to try this solution here:

Brave browser won't open on debian 64bit

0xcrypt, You should be able to launch from the Terminal, use brave-browser --no-sandbox. Additionally, it looks like there is an open issue for this with a potential workaround:

Let me know if this works for you.