Problem from terrain correction

For my working on sanp, I can’t autodownload the doppler-terrain correction, and it’s significant to be done, which site I can download my region DEM that matchs with snap DEM format?

you can download the SRTM data as GeoTiff from USGS Earth Explorer and hand it to SNAP as an external DEM in the Terrain Correction mode .

I tried ,but again it didn’t work