Type MATT in the command line and press enter or click on the ribbon button at the Add-ins tab. If you want to copy attribute tag values, select a block with attributes and a dialog box will appear. Using shift or control, select the attribute tags that you want to copy the values and press OK. Then, select the block to paste the attribute values or press enter to paste a block in another file or workspace.

Otherwise, if you want to paste attribute tag values, after starting the app MATT, press enter again following the instructions in the command line. Then, select the block in which you want to paste the attribute tag values. The destination block doesn't need to have the same name and doesn't need to be in the same workspace or file than the origination block. But must to have attributes with the same tag names as selected in the dialog box when copied.

The installer that was run when you downloaded this app/plugin from the Autodesk App Store will start installing the app/plugin. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart your Autodesk product to activate the app/plugin. To uninstall this plugin, 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 system application.