You can also manually install/uninstall via phpMyAdmin or directly in MySQL/MariaDB using SSH. The installation/uninstallation scripts are located in the module folder. If you are unsure about the process, it is advisable to back up both the database and the site beforehand, but @LeonidS can help you more.

It appears that the issue with the Channels module not reinstalling properly may be related to lingering records or cache problems in your database. Here’s a suggested approach to troubleshoot and resolve the issue:

Steps to Troubleshoot and Resolve the Issue:

Check Server Error Logs:

• Review the latest entries in your server error log file for any clues regarding the issue with the Channels module. This could provide insights into what went wrong during the uninstallation or installation process.

Clear Cache:

• If you want to reset the downloads page to indicate that the module is uninstalled, check if there is a cache you can clear. Clearing the cache can sometimes resolve display issues and allow the status to update correctly.

Manual Uninstallation:

• If the previous steps do not resolve the issue, you can manually uninstall the module. This can be done through phpMyAdmin or directly in MySQL/MariaDB via SSH. Make sure to back up your database and site before proceeding.
• Locate the installation/uninstallation scripts in the module folder.

SQL Query to Check Records:

• Use the following SQL query to verify whether any records related to the Channels module still exist in your table sys_modules in your database:

SELECT * FROM `your_database`.`sys_modules` 
WHERE type = 'module' AND name = 'bx_channels';

Delete the Records from the Database:

• If you find any records that need to be removed, use the following SQL command to delete them:

DELETE FROM `your_database`.`sys_modules` 
WHERE type = 'module' AND name = 'bx_channels';

Delete the Module from the Server:

• After removing the records from the database, navigate to your server’s file system.
• Find the folder for the Channels module and delete it completely from the server.
• Delete the cache and cache_public
• Review your files and folders permissions.
• Download and Reinstall the Module:
• Once you have ensured that the module is completely removed from both the database and the server, download the latest version of the Channels module via yoursite/studio/store.php
• Reinstall the module through your platform’s administration interface.

By following these steps, you should be able to successfully resolve the issue with the Channels module and restore its functionality. 

Note:

• It is possible that these commands may not resolve the problem if there are other related records in the database. If any remnants of the module remain after uninstallation, reinstalling the module may generate duplicate errors. Therefore, it is crucial to carefully search for and verify that no traces of the module are left behind before reinstalling.