Add a seat of Photoshop to my CC account

[ChrisStone]

Does anyone know if there's a way to pay more to add just an additional seat of one app to my plan?  I have a collaborator with whom I'd like to share files, but they don't have Photoshop.  Can I add a seat to my plan so they can see my files?

[John T Smith]

Your subscription allows YOU to install on 2 computers... you may NOT share with someone else

They will need to subscribe to either the special photography plan for about $10 per month (an ANNUAL plan) or just photoshop on a MONTHLY plan for much more, but which may be cancelled at the end of any month

SOME programs are available Monthly https://community.adobe.com/t5/Get-Started/Being-charged-for-a-full-year-when-i-m-on-month-to-month/... - links and pictures
-the special Photography Plan is ONLY available on an annual plan, with monthly or 1 annual payment

[Nancy OShea]

Seats are only available with business Teams & Enterprise plans. Your plan admin is the only one who can add/remove seats from your organization's plan.

Failing that, your collaborator needs to obtain his/her own subscription to Photoshop.

The Photography Plan bundle is the most affordable at USD $10/month x 12 months.

https://www.adobe.com/creativecloud/plans.html