If you still have a free trial license and wish to purchase AllsystemsMax, this is the only place to do that.
Likewise, it is the only place to purchase a license for additional workstations, after installing the software under a trial period license.
You cannot purchase these items at the AllsystemsMax website.
After your trial period is expired, you can also purchase phone support if you need it to supplement the free support options as described at allsystemsmax.com.