I made a simple exe program, configured Dotfuscator Professional Edition and started Build. Dotfuscator created a Dotfuscated folder containing a new exe file. I opened the new exe in DotPeek and there I can see exactly the same code as I wrote.
Earlier I also tried to use the free Dotfuscator Community version and got some kind of obfuscation.

What have I done wrong? Why does the free version work as expected while the professional does not?

eval_z). Try adding a comment to your source file, recompiling, re-running Dotfuscator, and checking if DotPeek shows you the comment. Also, your second image doesn't appear to be from the free Dotfuscator Community, as Control Flow obfuscation seems to be present. - Joe Sewellhttps://imgur.com/a/sILdKdS- Сергейexefile to other folder and rename it. after all manipulation dotPeek has shown obfuscation like this ::https://imgur.com/a/U13tdAH- СергейdotPeekopen other files. why ? - Сергей