Adobe DC it says the serial number is not good.

Also, where did you buy - from whom?

I should have been clearer. I assume you downloaded a file and are trying to install. What is the EXACT name of what you downloaded?

Let's check the details.

1. Where did you buy?

2. Is it a student version?

3. Does it SAY it is a serial number or does it say something else like product code, eligibility code, ...

4. What is the exact name of what you downloaded?