First of all, I don't know how you ended up on that forum when the original link was for BC.
As for MBAM, the trial will end naturally 14 days after you installed it but to manually end it - open MBAM and click on Settings then on Account Details where you'll see the button to end it.
For the Windows Update error, did you get this when trying to download or install updates, or after a manual check for updates ?
Let's see if the update service is set correctly.
Go Start - type services.msc and press enter - you may need to expand the window but scroll down to Windows Update and ensure it is set to Automatic (Delayed) and showing as Started.
If it is not showing as Auto then right click on it and select Properties then use the dropdown to change it to Auto (Delayed) or just Auto - Start - Apply - OK
Close the Services window, reboot and try the updates again.
Let me know if you get an error when trying to start it.
Sometimes changing the update settings to Never check - rebooting and changing it back to Check for but let me choose.. can sometimes work.
Work your way through the steps in this article for Troubleshooter and then Fix Windows Update problems and then try them again.
https://support.microsoft.com/en-us/help/947821/fix-windows-update-errors-by-using-the-dism-or-system-update-readinessIf they still produce an error which may be a different one, perform a sfc /scannow to see what it reports.
If it reports it is unable to repair some files, then download SFCFix.exe and post its report.
http://www.majorgeeks.com/files/details/sfcfix.htmlThat may tell you to run SURT which is the System Update Readiness Tool.
Lower down on that Troubleshooter page you will find download links for the SURT version you will need to download, but it can resolve a number of update problems on its own, if you want to run it before a sfc /scannow.
The 64 bit version is a 533MB download and can take a while to run but its log can be found in Windows C:\Windows\Logs\CBS then double click on the Checksur one which will open in Notepad.