How can I resolve issues with a deprecated marketplace kit on Shopify CLI 3?

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Beginner Shopify Developer here, I came across Shopify's marketplace kit recently where one of the first steps was to clone a merchant app from a GitHub repo following the tutorial. But I found out that it's deprecated because its quite old and it doesn't work with Shopify CLI 3, I couldn't get it to install the required dependencies and run it using npm run dev. Any idea how do I go about resolving this? Will I have to build my own app now or is there any way I can utilize the old deprecated app and make it work somehow?