I've written a comment on one of the community threads about this as well. Basically, I've copied the wpmudev-updates folder into my plugins directory and have activated the plugin and I'm able to access the WPMU DEV dashboard.
I'm installing the Directory plugin. But once it starts unpacking after downloading, I get the following error
Downloading install package from https://premium.wpmudev.org/wdp-un.php?action=install&key=848dd3d84e469268992c80458e33e63350e30e2f&pid=164…
Unpacking the package…
Could not copy file. directory/core/data.php
I have done the following:
1. Manually created the mu-plugins directory in wp-contents
2. Made sure the web application has permission to write in this directory and have set the permissions to 755. Ensured the default FTP path in wp-config.php is set to wp-contents directory and also the default path on the ftp server.
Can you please help me as soon as possible as I need to get this out before the end of the week.