I upgraded to your paid account but haven't been able

I upgraded to your paid account but haven't been able to use ANY plugins from WPMUDEV since. No matter what the plugin is, I get an error like the one below. This only affects WPMUDEV plugins, not other WP plugins. Please advise.

The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature