Welcome in the forum!
You will need a (free) license for Keil compiler(8051 PSoC3). Easiest is to obtain it via email, just follow the link, fill out the form and enter the code received by mail. No spam, no ads, no fee.
Every time there is a major upgrade for Creator or a new- /re- installation you will need to repeat that procedure.
But if I am using PSoC 4, why am I getting this warning? Can I ignore it if I use only PSoC 4? [People still use 8051???]
AND, I did fill out the form and got no reply from Kiel. I even checked junk mail as they suggested.
Please, do I need license for PSoC 4 Creator projects? I am not using PSoC 3.