how do I update a LOGINserver

I just got the EtreCheck from the Apple Store and ran it. In my case, at least, the LOGINserver relates to my Brother printer. I will try to update that and see if the warning then goes away.

You'll have to wait until Brother provides an updated printer driver for your model of Brother printer. If you remove it from the login items they will not launch and you should no longer get that warning.k

You don't need LOGINserver, NETserver, or USBserver. They are all installed at /Library/Printers/Brother/Utilities/ and can just be left alone.

As I recall Brother installed them as Login Items. Remove them from Login Items by following the instructions under Add or remove automatic items in Open items automatically when you log in on Mac:

• Remove a login item: Select the name of the item you want to prevent from opening automatically, then click the Remove button — below the list.

They are not required to use your Brother printer.

How do I update LOGIN server???

after every software update that I get on my imac I get a message saying that the LOGINserver is not optimisd for my mac, and needs to be updated, and that the app will not work with future versions of mac OS. Contact the developer for further information.

How do I update this? is it not part of the apple OS?

"LOGINserver" is not a native macOS process that I'm aware of. It may have been installed as part of another app running on your Mac.

It may be running from /Library/StartupItems/ folder which Apple no longer recommends. This may be because it is outdated software and why you are getting the warning when it attempts to run.

You would need to know who provides it in order to find out if: 1) You still need it, and 2) They offer an updated version to work with macOS Mojave.

One method to try to locate it, would be to run an EtreCheck report. It should identify where it is located on your Mac and potentially identify the developer.

To help troubleshoot your Mac, I would suggest that you consider using EtreCheck and posting the resultant report for us to review. (Note: The EtreCheck report does NOT contain any personal information.) 

• You can download EtreCheck from here.
• Start EtreCheck from a normal user account. Optionally, you can run it from a user account with Administrator privileges.
• Select a problem from the drop-down menu to enable the "Start EtreCheck" button. Optionally, you can add comments on what issues your Mac is experiencing, especially to aide others with similar Mac issues.
• Click on Start EtreCheck
• Allow the program to run to completion.
• When done, select Report from the left-side window to display it.
• Select the Share Report icon, then select Copy Report.
• Paste the report to your reply post. Hint: Use the Add Text option from the ASC editor's menu bar.

Ref:

• Using EtreCheck - ASC (etresoft)
• How to use the Add Text Feature When Posting Large Amounts of Text, i.e. and Etrecheck Report - ASC (Old Toad)
• EtreCheck Versions:
  • EtreCheck "standard" is available from the Apple App Store. It's free and will allow you to remove adware "infections." However, there are some in-app purchase costs for some features.
  • EtreCheck Pro is a paid version and is available as a download directly from the EtreCheck website.

This is being caused by your printer. Do you have Brother? Check libraries>printers>brother>utilities