All organizations which use VSys One are given an organization-specific serial number which is paired with their organization name in their welcome letter. VSys won't start without that company name/serial number combination, or if either value is incorrect.
Some serial numbers - for demonstration versions or for those whose account is not yet paid up - have built-in expiration dates. After the expiration date, VSys will no longer start until a new registration code is entered.
Enter a code through the Enter VSys One registration codes form. You must use the Organization name as indicated in your contract for the serial numbers to match. As appropriate, use the (add) hyperlink to enable add-on products like VSys Live.