I haven't actually done it myself because I run Linux (GIMP lives up to its name but RawTherapee is way better than Lightroom). Originally it was just for students then they opened it for everyone.
Unsure if you have to add a CC, so remember to cancel if you do add one and don't want it after.
Annual subscribers might need to be a bit wary, but monthly subscribers seem to be able to cancel and attach it with no drama.
Step 1: Log In to Your CC Account
Head on over to Adobe’s website and log in to your Creative Cloud account.
Step 2: Cancel Your Plan
On your account overview page, click the Cancel Plan link on your current subscription. (Don’t worry — you won’t actually be cancelling your account.)
Step 3: Go Through the Cancellation Steps
After an account verification process, you’ll be presented with some steps to confirm that you really do want to cancel your account. Go through these steps, past the Feedback and Details page and to the Offers page.
[Update: We’re hearing that you should try selecting “It’s too expensive” as the reason you’d like to cancel.]
[Update: If you see a warning about an early cancellation fee, accepting and clicking past it may lead you to the offer before you finalize the cancellation.]
Step 4: Accept the Offer
To keep you as a subscribe, on the third step (Offers), Adobe should present you with an offer to get the next two months of your plan for free. Simply click Accept Offer.
Step 5: Voila! Two Months Free!
That’s it! You should be taken to a confirmation page that says your plan was updated with a free credit for 60 days. You’ll also see how much you saved by doing these few steps.
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worked fine for me… 2 months free