Option to cleanup missing modules

This module is not fixing my problem with missing module errors updating to 7.50!
Updating from 7.44 to 7.50 I get numerous warnings of the form:
User warning: The following module is missing from the file system: invisimail. In order to fix this, put the module back in its original location.
Having installed this module, if I look at the status report I see:
Check for missing modules in filesystem - No missing modules detected.
even though the missing modules are listed in the System table in the database.
Looking at your code snippets for the option to remove/clean up the missing modules, if I am reading your code correctly what you do is to identify the missing module by looking at the 'Status' field to see if it set to 1 indicating that it is enabled; and to remove/clean it up by clearing this flag to zero.
Looking at my System table I see that the Status field is already zero for all the missing modules which presumably explains why I get the 'No missing modules detected' report.

This suggests that the Drupal Update.php is looking for something more than a zero status field for a missing module to say there is not a problem with it. Without debugging Update.php (which I would probably find impossible) I don't know what else it needs. Would deleting the whole record work? or would that have implications elsewhere? I don't know, but I hope somebody does because my site is out of action until a solution is found

I downloaded the only version available yesterday, which was 1.0. Looking today I now see as the only version - version 1.1!
I uploaded 1.1 to my website and it does now list the sixteen modules which had been identified as missing.
However, when I click the 'Remove' link I get:
Internal Server Error:The server encountered an internal error or misconfiguration and was unable to complete your request.

Could I suggest that, after fixing the problem, that where you give the list of missing modules you give the name of the module rather than just a link to the module on the Drupal website

I'm not sure what I'm looking for, but the server log only logs the latest 25 errors and I appear to be getting an extremely large number of errors - more than twenty five a second!!!
Capturing the log immediately after attempting to delete a module the errors listed include 'r->uri', 'redirected from r->uri', 'Zlib compressed 538 to 235' and 'File does not exist: /domains/b/e/...../public_html/favicon.ico
I don't suppose any of this is any help to you! Sorry!