Purchase a WizTree supporter code here.
After you receive your supporter code, launch WizTree and press F12, or choose "File->Enter Support Code..."

The "Enter Supporter Code" window opens. Type in your code and click the 'OK' button to activate it.

If your code won't validate, make sure your firewall, antivirus or other security software isn't blocking WizTree's internet access. WizTree needs to reach our server at "antibody-software.com" to confirm the licensing data tied to your code.
With an Enterprise license, yes - your code covers every PC across your organization.
With a standard supporter code, it's also yes, as long as it matches your business (staff) size. Each business site needs its own code, so companies with offices in multiple cities need a separate code per location.
Keep your supporter codes private and don't share them publicly.
Use this form to have your supporter code sent to your email.
Your code works with every WizTree version released within one year of your purchase date. Just install the newer build over the existing one - there's no need to uninstall first, and your license details will carry over automatically.
To upgrade, just download the newest version and run the installer. You don't need to remove your current copy beforehand.
Size shows a file's actual data size. Allocated shows how much disk space is actually reserved to store it on your drive - always a multiple of the NTFS "cluster size," the smallest chunk of storage that can be assigned. Compressed files usually show a smaller allocated size than their file size.
A = Archive, R = Read Only, H = Hidden, S = System, C = Compressed
Turn this on or off from "Options->Show Free space on Treemap" to see how much unused space remains on your drive.
Uncheck "Options->Always Run as Administrator". You can also open the WizTree3.ini file and set actRunAsAdmin_Checked=FALSE. WizTree3.ini sits in %appdata%\WizTree3, or alongside Wiztree.exe if you're using the portable version. Keep in mind that fast NTFS scanning only works with admin rights.
Certain NTFS system data (like directory indexes and file security records) takes up hard drive space but isn't treated as a regular file. Since these items never appear in WizTree's scan results, the total allocated space it reports will typically be a bit smaller than the "Space Used" figure Windows shows for the drive.