Error Installing Sitecore XM/XP - Populate Managed Schema failed with 500 (Internal Server)

If you are encountering an issue with the Sitecore Installation Framework (SIF) while trying to populate the managed schema for Solr, there are a few potential causes and troubleshooting steps you can follow:

1. Verify Solr connection: Ensure that you have the correct Solr instance details configured in your Sitecore installation files (for example, the `solrUrl` setting in your JSON configuration files). Double-check the Solr URL, port, and any authentication details.

2. Check Solr availability: Make sure that the Solr server is running and accessible from the machine where you are running the Sitecore installation. You can test the Solr connectivity by accessing the Solr web interface in your browser.

3. Validate Solr schema configuration: Verify that your Solr schema configuration aligns with the version of Sitecore you are installing. Different versions of Sitecore require specific schema configurations, so ensure that you have the correct managed schema file for your Sitecore version.

4. Check Solr logs: Examine the Solr logs for any errors or warnings that might shed light on the issue. The Solr logs can provide valuable information about potential problems with schema updates or configuration conflicts.

5. Permissions and access: Ensure that the user account running the Sitecore installation process has the necessary permissions to interact with Solr and modify the schema. Make sure the user account has appropriate write access to the managed schema and other Solr configuration files.

6. Retry the installation: Sometimes, temporary network issues or other factors can cause a failure during schema population. You can try rerunning the installation process to see if the issue resolves itself. It's also a good idea to clean up any partially created Solr cores or schema artifacts before retrying.

If the problem persists or you need more specific assistance, please provide any error messages or additional details about your setup, such as the version of Sitecore, Solr, and any relevant logs.

While opening the site, you might see below error

To fox the above error, need to ensure following frameworks need to be enable for IIS services by navigate to Turn window features on or off and verify the selected options as below.

The below snap shows after enabling the frameworks that is required for Sitecore Site.

With the above changes, Site will come up and this is the one of issue found during my installation with Sitecore Site.