To check the integrity of your Kryptor download, you should verify the hashes provided on on the Downloads page.
If you don't want to download any softare, then the easiest way of checking the hashes is to upload the downloaded file to VirusTotal and go to the 'Details' tab.
Alternatively, you can use the free and open source tool that I developed called HashMe to quickly check the MD5, SHA1, and SHA256 hashes of downloaded files. HashMe is a portable program that works on Windows, Linux, and macOS with the same requirements as Kryptor (.NET Framework 4.8 or Mono must be installed).
Download HashMe.exe, run the program, and then drag and drop the downloaded Kryptor file onto HashMe and compare the SHA256 hash to the hash on the website.