The ZipEx actions plugin was updated today. The new version does not freeze the host application any longer during long operations, causing "Not responding" notices or static screens.
Additionally, you can now use the StatusDlg actions as well with this plugin, if you want a simple way to retrieve feedback about the compression or decompression operations that are being performed by the plugin. This means that you can use both a custom screen and the StatusDlg for displaying progress of the operation, like shown in this installer:
The new build is available for both Lua 5.0 and Lua 5.1.