All you have to do, to extend your trial period, is change number in TrialKey element in application.xml. This file is located in /Library/Application Support/Adobe/Adobe Photoshop/AMT. You can navigate there with this command:
cd /Library/Application\ Support/Adobe/Adobe\ Photoshop\ */AMT
Then you have to open the file and edit it. You can use just TextEdit app.
open -a TextEdit application.xml
Now find the TrialSerialNumber Data key:
<Data key="TrialSerialNumber">911997074887979240115317</Data>
And increment this number by one:
<Data key="TrialSerialNumber">911997074887979240115318</Data>
And that’s it. Now when you relaunch Photoshop you will be prompted to login and you should see fresh 7 days of trial.
lol dont work. but you can make a new account, install adobe creative cloud app, then if you dont own the app you go to it and click "start trial" it works for me so yea.
EDIT: Basically install adobe creative cloud, then open it, it'll ask you to buy the app but you can deny it, then clikc on the white "start trial" button. From what I know you don't need a credit card, and if you do, you can use as many times as you want for the trial :)