Please check the System Requirements for nopCommerce 4.1 here. You might get the 502.5 error if you don't have the .NET Core 2.1 runtime installed on your server.
As per nop-templates post I download the .net core and its works and nopcommerce installation screen opened for setting. After enter the all fields i got the below error
We're sorry, an internal error occurred.
Our supporting staff has been notified of this error and will address the issue shortly.
We apologize for the inconvenience.
Please try clicking your browsers 'back' button or try reloading the home page.
If you continue to receive this message, please try again in a little while.
Delete the file Nop.Web\App_Data\dataSettings.json if it exists (keep a backup to look at later) Run the the website and see if it will do the standard installation If that works then change the dataSettings.json file to point to your new database See what happens then
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