The program is not able to copy the Sample Data Set into c:\Users\Public\Documents folder. This problem can occur for both the DK and Editor products.
The most common reason for this problem is this Windows "Controlled Folders" setting.
The easiest workaround is to disable this feature (i.e., add the TatukGIS software to the trusted list) at the time of installation. Refer to Microsoft guidance provided at: Controlled folder access. Alternatively, simply unselecting Sample Data from the installation should also work.
For sure, the TatukGIS setup program is not ransomware! Unfortunately, Microsoft does not offer a fast and easy way to acknowledge this and grant access to the folder.
In a forthcoming version, TatukGIS will modify the installation procedure to install sample data in a different location.