In short, no. Do you have the stock files on your system? If not, you will need to go back to infopop and download it again. This has happened to me also, that's why I now copy the entire stock folder and never touch the original.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.