"- FromNode/ToNode assign to Links Shp - combine nodes with links shapes by defining two additional column fields in the polyline shape file with the closest distance node point, within a snap tolerance."
2nd question: appears to be a problem with number format at your pc and swmm - try to open inp file as a text file and replace commas with points.
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Please refer to inp.PINS help website: https://sites.google.com/site/inppins/
1st question: