We will have an update tomorrow. I really hope. We are running final testing and all looks good.
About installing manually. It is very easy. Just download your extension, open archive and upload 1 directory.
See this manual:
http://www.abantecart.com/ecommerce-documentation/61-admin-user-manual/extensions-menu/extension-store#FTPinstallNew version will have more options to install the extensions.
We are all about making this easy