Urp7.4.3改unity2019.3低版本支持
类似问题：
unity社区
Github记录
Github

步骤1
找到文件复制github代码修改 package.json

打开package.json,复制进去下列内容：

  
{
    "name": "com.unity.render-pipelines.universal",
    "description": "The Universal Render Pipeline (URP) is a prebuilt Scriptable Render Pipeline, made by Unity. URP provides artist-friendly workflows that let you quickly and easily create optimized graphics across a range of platforms, from mobile to high-end consoles and PCs.",
    "version": "7.4.1",
    "unity": "2019.3",
	"unityRelease": "2f1",
    "displayName": "Universal RP",
    "dependencies": {
        "com.unity.render-pipelines.core": "7.4.1",
        "com.unity.shadergraph": "7.4.1"
    },
	"keywords":[
        "graphics",
        "performance",
        "rendering",
        "mobile",
		"render",
		"pipeline"
    ]
}

步骤2
注释掉报错代码，等待重新编译。等待时间较长，需要把整个项目资源重新编译。
7.4之后灯光有变化不支持低版本

完成后可使用。
附：URP软件包版本与Unity编辑器版本的兼容性