If you stuck at download rvsitebuilder.tar.gz error or download template error while installing RVsitebuilder in DirectAdmin. Please do the following solution.

1. Run following command: 

cd /usr/local/directadminchmod 0755 /usr/local/directadmin/directadmin./directadmin p        

* One long line command2.

nano -w /etc/mime.types 

3. Add mime-type in this file: /etc/mime.types

By the following value: 

application/x-gzip 

4. Restart directadmin

service directadmin restart 

5. Back to DirectAdmin Admin -> RVsitebuilder Installer , to complete RVsitebuilder installation. 

Reference: http://forum.directadmin.com/showthread.php?t=42234http://forum.directadmin.com/showthread.php?t=36103