If you are an instructor and want to provide a 1 timeout year ArcGIS license for your student, please make a request to ESRI at http://www.esri.com/industries/apps/education/offers/promo/index.cfm.
If you teach regularly, please request enough installation codes to minimize the need to make additional requests for a particular version of ArcGIS.
Direct students to https://depts.washington.edu/arcgis/pages/obtaining-arcgis-software for download of the ISO files for installing ArcGIS. Students can either burn DVDs or use tools such as MagicDisc to mount ISO files as virtual drives.
Additional instructions for students can be found at Running ArcGIS on your own Windows-based computer, with specific instructions for students who are off campus.