When you download the portable version (usually a ZIP), you will find:
If you found a file named exactly R-Undelete 4.9.Build 159222 Portable -x86 x64- online, I strongly advise deleting it and scanning your system with a reputable antivirus (e.g., Malwarebytes, Windows Defender). Such builds are unverified, often backdoored, and unsafe. R-Undelete 4.9.Build 159222 Portable -x86 x64- ...