BILxSRTM Download

Can't find reputable website to downoad BILxSRTM. Can someone tell me where I can download this?
https://railworksamerica.com/forum/
https://railworksamerica.com/forum/viewtopic.php?f=29&t=17004
JohnTrainHead wrote:This site may still work:
http://dds.cr.usgs.gov/srtm/version1/Un ... c/1arcsec/
bnsfsubdivision wrote:Here.