Downgrading SQL Server database and moving it to another computer I have created database on my computer using SQL Server 2019, and now i want to move it to another computer that has SQL Server 2014 installed on it. 

Do I have to download SQL Server 2014 and downgrade the database or there is another solution for it? What should I do?
There's no such thing as downgradning the physical database. You would have to (use a tool that) script out your objects (CREATE commands) and the data (as INSERTs or some BCP files). And hope that you don't use anything on your 2019 that isn't available on 2014.

Such tools can be BACPAC, SSDT, "Generate Scripts" in SSMS.