I don't think there is a way to delete the update since it also updated the company file.  Maybe support would be able to help but I don't think there is a way to revert unless you have backups of the file and on the workstation.  That also means that the date of the update and you try to restore now then you would have to re-create all the transactions you have entered since the update.  THIS IS NOT ACCEPTABLE.  I agree with you 

This is beyond LUDICROUS!