All the Adobe programs except for Acrobat DC & Lightroom 6 are now only available as a subscription through Adobe.
If you want to purchase adobe programs other than these then you'll have to purchase a subscription for it.
If you need Acrobat DC or Lightroom 6 then please refer to the links below :
1- To Buy Lighroom 6 Go to: https://www.adobe.com/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_softwar e_sl_most...
2- You can purchase Acrobat DC desktop only ( perpetual / standalone license ) from here : Adobe Document Cloud | Adobe Acrobat DC
As Bani says, Adobe is transitioning to subscription only plans for the most part. However, it may be worth calling the number on this page Creative Cloud now includes Creative Suite Master Collection and Design Premium features and inquiring whether you can still purchase CS6 at a student rate.
start at http://www.adobe.com/education.html
-Cloud Education Plan https://creative.adobe.com/plans?plan=edu
-One Year Intro Price https://community.adobe.com/t5/Get-Started/Student-plan/td-p/10209357
-Redemption Code https://creative.adobe.com/educard
-ID Proof http://www.adobe.com/store/au_edu/academic_id.html