Guide
How to Install Brushes in Blender 4.3-5.x: Asset Library Guide
To install brushes in Blender 4.3-5.x: open Edit → Preferences → File Paths, add your brush pack folder as an Asset Library, then enable that library from the brush shelf filter in Sculpt Mode. This guide, based on real screenshots from Blender 4.5 LTS, covers that Asset Library method plus the classic append method for Blender 2.8-4.2, and fixes for the most common install problems.
This guide covers the exact menus, settings, and quick fixes if brushes do not appear after install.
4-step quick guide (Blender 4.3-5.x)
Full screenshots for each step are below.
Full walkthrough: Blender 4.3 - 5.x (Asset Libraries)
Step 1 - Open Preferences
Menu: Edit -> Preferences

Step 2 - File Paths
Open the File Paths tab, find Asset Libraries, and click the + button.

Step 3 - Select Folder
Choose the brush pack directory and click Add Asset Library.

Step 4 - Enable Library
Go to Sculpt Mode, open the brush shelf filter, and enable your brush catalog.

Video walkthroughs
Two quick demos that show the installation flow and how the brush library behaves once it is enabled.
Blender 2.8 - 4.2 (Classic append method)
Versions before the Asset Browser landed (Blender 2.8 through 4.2) do not support Asset Libraries, so brush packs load through the classic Append method instead.
File -> Append
Select the .blend file -> Brush folder
Append brushes
(Optional) Save Startup File
To install a full .blend brush library this way, append every brush in its Brush folder at once rather than one at a time, then save your startup file if you want the library available in every new scene.
Fix common installation problems
Most brush install issues come down to the library not being added correctly, or Blender not refreshing after a change. Work through these in order.
FAQ
Why don't my brushes show up after installing them in Blender?
Restart Blender. The brush shelf and Asset Browser both cache library contents and often need a fresh session before new brushes appear.
Why is my Blender Asset Browser empty?
The Asset Library usually was not added correctly. Re-add it in Edit → Preferences → File Paths → Asset Libraries, and confirm the path points directly at the folder containing the .blend files.
How do I install a .blend brush library in Blender?
Add its containing folder as an Asset Library in Edit → Preferences → File Paths, then enable that library from the brush shelf filter in Sculpt Mode. No append step is required.
Do old Blender brush packs still work in Blender 4.3-5.x?
Brush packs built for Blender 2.8-4.2 use the classic append workflow and are not automatically Asset Browser compatible. Use File → Append, or check whether the pack ships an updated Asset Library version.
How do I update or remove a brush library in Blender?
Go to Edit → Preferences → File Paths → Asset Libraries, select the entry, and use the - button to remove it, or replace the folder contents in place to update it. Restart Blender afterward.
Useful links
Hotkeys for Blender sculpting · Best Blender sculpting brushes list · Blender sculpting beginner guide
Browse all Blender sculpting brushes · Explore the 3000+ sculpting brushes bundle