Yeah, why on my computer when run Smart Update, this note that : this version Up - to - Date. Now last version in my computer is 5.0.0.172 while on PCTools is 5.0.0.174
To get the latest version, uninstall the current version, remove the folder from c:\Program Files\Spyware Doctor. Re-download SDv5.0.0.174 from http://www.pctools.com/spyware-doctor/upgrade/ and install the file.