Oh, that’s still fine. Actually, coincidentally, I indirectly specify that in my new download instructions anyways (clicking the “View Content” button, clicking “Download,” etc.).
A bundle is installed in Krita via the menu ‘‘Settings’’ >> ‘‘Manage Resource Libraries…’’ and in the opening dialog you have to click the button + Import in the next dialog browse to the downloaded bundle, select it and confirm the selection. Now Krita imports that bundle, and you can use its content, so the brushes in case of this bundle.
By the way: Not bundled resources are installed into Krita via ‘‘Settings’’ >> ‘‘Manage Resources…’’ where you have to click on the button Import Resources and then browse to and select the resource in question, click on okay, or however a selection is confirmed with your file manager, and the resource is installed. In seldom cases, you may need to restart Krita afterward, but usually you can use the resource right away.