If you have a working PND from 2012, connect it to a PC via USB and copy the entire iGO folder to your hard drive. The Nngnavi.exe inside is safe to reuse on identical hardware.
Distributing or downloading copyrighted navigation software without a license is illegal in most jurisdictions, even if the product is outdated.
If you own a legal copy of iGO My Way 2012 or iGO Primo 2012, the original disc contains Nngnavi.exe. Copy it directly from the /Program Files/iGO or /Storage Card/iGO folder.
If you own a legal license and cannot find your original disc:
Never double-click Nngnavi.exe on a modern Windows PC. It is designed for Windows CE or embedded systems and will not function correctly outside that environment.
Occasionally, official update files from 2012–2013 are preserved on archive.org. Look for files named iGO_Primo_2012_Setup.exe or official patches. These self-extracting archives contain a clean Nngnavi.exe.