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Launch the License Manager from the bin folder (by default "C:\Program Files (x86)\Embarcadero\Studio\21.0\bin\LicenseManager.exe") and delete any trial or beta (Test Field) license that you can find. Check it under “License Details” in the center column.Under your Control Panel's Program and Features Add/Remove Program uninstall the following entries: RAD Studio 10.4 version 21.0Please follow these instructions to remove any leftover files: If Windows 64-bit, remove the C:\Program Files (x86)\Embarcadero\Studio\21.0 directory (or the custom folder you had used). Remove the C:\Users\Public\Documents\Embarcadero\Studio\21.0 directory Remove the C:\ProgramData\Embarcadero\Studio\21.0 directory. Remove the %APPDATA%\Embarcadero\BDS\21.0 directory. Remove the HKEY_CURRENT_USER\SOFTWARE\Embarcadero\BDS\21.0 registry key If Windows 64-bit, remove the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Embarcadero\BDS\21.0 If Windows 64-bit, remove the following files from C:\Windows\SysWOW64\: BDEAdmin.* CC32*.DLL Midas.* Xerces*.DLLField testers should also do the following (and others may want to as well): Delete the Godzilla license from License manager before uninstalling it or during the installation of RAD Studio 10.4 SydneyIf you had problems in the second step (uninstalling from Windows Control Panel), try this Microsoft tool to solve un-installation problems:http://go.microsoft.com/?linkid=9779673