Type MATT in the command line and press enter or click on the ribbon button at the Add-ins tab. If you want 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 in a block in other file or workspace.

Otherwise, if you want to paste attribute tag values, after start the app MATT, press enter again following the instructions in command line. Then, select the block that you want to paste the attribute tag values. The destination block don't need to have the same name and don'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 dialog box when copied.

The installer that was run when you downloaded this app/plugin from 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.