UE修改文件缓存，释放C盘缓存

找到安装目录\Engine\Config

打开文件BaseEngine，查找InstalledDerivedDataBackendGraph

 [InstalledDerivedDataBackendGraph]条目下把%ENGINEVERSIONAGNOSTICUSERDIR%DerivedDataCache修改成

%GAMEDIR%DerivedDataCache即可