Porblem with coregistrartion

Hi there, I have problem with Back Geocoding and S-1 Top Coregistration, this is fist time that i have this problem with Coregistration, I intsalled versio 8 of SNAP and I want to analyse some satelite images and when I put stack otb file on Back Geocoding he doesn’t want to star always is 0%, and it is same when I try S-1 Top coregistartion. I tried with older version SNAP version 7 and it is the same.
Do you have some advice or solution?

related to this issue: SRTM ZIP-files are corrupted or not found

Please select SRTM 1Sec HGT (AutoDownload) instead, the error will soon be fixed.