If you're seeking a free or portable version due to financial constraints, exploring the free trial of Adobe Photoshop CC or considering open-source alternatives like GIMP might be a good starting point.
. The Creative Suite (CS) series officially ended with CS6 in 2012, after which Adobe transitioned to the subscription-based Creative Cloud (CC) Key Facts About "Photoshop Portable" free download adobe photoshop cs7 portable link
For those looking for the power of Photoshop without a high cost, there are better paths: Adobe Creative Cloud Photography Plan: If you're seeking a free or portable version