Select one or more obsolete blocks and run the BUpdate command.
The command will offer to select a file with updated blocks.
The command will find blocks in the specified file with the same names as the blocks in your file and make a replacement. The names must match exactly.

Note that the block definition (BlockTableRecord) will be overridden, so all occurrences of that block (BlockReference) will be updated, not just the ones you selected.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.