ArcSWAT is an ArcGIS-ArcView extension and interface for SWAT.
Download ArcSWAT 2012.10.23 (8 June 2020) for ArcGIS 10.6 and 10.7, or earlier versions for ArcGIS 10.0-10.5. Remember to uninstall any previous versions of ArcSWAT before installing a new version.
For ArcGIS 10.3:
Note: 10.19 is the final ArcSWAT version for ArcGIS 10.3.
For ArcGIS 10.2:
Note: 10.19 is the final ArcSWAT version for ArcGIS 10.2.
For ArcGIS 10.1 SP1:
Note: 10.18 is the final ArcSWAT version for ArcGIS 10.1.