The following TrueSizer e3 error can occur during download and installation. "The signature of True Sizer_e3_Setup.exe is corrupt or invalid". This has occurred because the Antivirus software has blocked the .exe file.


With some antivirus software, rebooting the PC is required after disabling. Disable your antivirus software temporarily and try the procedure again.

After TrueSizer e3 has been installed successfully, enable your antivirus software.

Warning: Your PC becomes vulnerable after the antivirus software is disabled. Please do not check your emails or visit any websites until the antivirus software is turned on. Please do not forget to turn on the antivirus software after the procedure.