Could you fix SeaDrive client to obey SparkleAlreadyEnableUpdateByDefault = true and CheckForUpdates = 0 from HKLM for new users as SeaFile client already does. Now SeaDrive first checks HKU\Software\SeaDrive\Seafile Drive Client\Misc\SparkleAlreadyEnableUpdateByDefault and if it’s not set it doesn’t check HKLM at all. This behaviour makes it obsolete to configure HKLM values.
As I said SeaFile client does it properly so I hope you can also fix SeaDrive.
University of Turku