You can enable an advertisement that has been disabled in order to resume availability of the associated program to client computers.
How to enable an advertisement
In the Configuration Manager console, navigate to System Center Configuration Manager / Site Database / Computer Management / Software Distribution / Advertisements.
Right-click the advertisement you want to enable, and click Enable Program.
Note You can also enable a program directly from that program's properties dialog box. For more information about how to do this, see How to Enable a Program.