help me build my source code by visual studio code

I purchased a project from Fiverr, and asked for the source code
When I got the source code, the service provider does not accept to explain to me how to build the project via visual studio code
And when I learned on YouTube, I understood that I had to write the command "npm run build".
But when I try it it shows me this error
"'react-scripts' is not recognized as an internal or external command,
operable program or batch file."

I don't know if I should use an older version, or if I'm not using the program correctly or if there is a deleted code from the code itself?

I want to solve the problem
And teach me how to extract the project myself.
And teach me how to extract the project myself.



It is preferable for those who accept to solve the problem for me via the team view
It is preferable for those who accept to solve the problem for me via the team view
It is preferable for those who accept to solve the problem for me via the team view
It is preferable for those who accept to solve the problem for me via the team view