Are you an Act! user on an older version, specifically one developed from 2004 to 2015 (Act! 2005 to v17)? If so, you need to take immediate action to preserve your access to your Act! database. You will need to upgrade to a newer version of Act! or convert to another CRM. Otherwise you are at risk of losing access to your data on January 1, 2019!
Why is this happening?
You may or may not know this, but most software relies on third-party components to add functionality.