If you wish to check the authenticity of the downloaded files, you can check the SHA-512 hash of the files on your computer match those listed below, using HashMyFiles or similar.
If the results do not match the values given below, please download Sudoku Now! again from this website, and reinstall it.
SHA-512 Hash Values
For SudokuNowSetup200en.exe, the file downloaded from the above link: 8217cbc18f7cdab61e4e4d2b9302cea650b1581ff087f72e3e7363ff6a67faef9368f9d08327ab1021d1d514532ac70ebd54d90129623d194302e19a7b299c18
For SudokuNow.exe, the main executable which normally gets installed in Neon Sine Software\Sudoku Now 2, located inside your Program Files or Program Files (x86) folder: 7687d10eb90b4cdead95ff00bf420fc91bdc8ca63c9d7741db3f46c282b3116e46d5bacfb081e7d4f69c30bc0c04bf34653ab7f8565c42e4b32c79e85e917850
Almost any PC running Windows XP or later will be suitable.
It may still run under Windows 98, but this is no longer tested or supported.
Using the Download
After downloading the Sudoku Now! setup file (SudokuNowSetup200en.exe) open the file (e.g. double click it) and follow the on-screen instructions.
After installation, start Sudoku Now! from the Start menu, or the desktop shortcut if you created one during installation.
You may wish to begin by viewing the help file. This can be accessed either from the Start menu or by choosing Contents from the Help menu in Sudoku Now!