Ran into this problem on a few macs. The scenario is that you've uninstalled teamviewer on macOS catalina and now your mac won't boot. Instead it give you an error that reads: "Unrecoverable Error. SecurityAgent was unable to create requested mechanism TeamViewerAuthPlugin:Start.

Basically it's a file that the OS is looking for to boot and it can't find it. Solution? Put it back. How?

The Fix Option 1 - Target Disk Mode:

• Requires a Thunderbolt cable to connect two macs together. 
• Get another mac that is not the broken one, duh. 
• Download the file you need to replace here.
• Unzip the file.
• Boot the broken mac to target disk mode by holding the T key during boot, until you see the thunderbolt Icon on the screen.
• Connect both macs together via thunderbolt, the broken mac's hard drive will show up as an external HD.
• In the Finder, from the root of the broken mac's hard drive navigate to: /Library/Security/SecurityAgentPlugins/
• Paste in the file you downloaded above.
• Restart the broken mac. 
• Done. Hooray. 

The Fix Option 2 - USB Thumb Stick & Terminal Command:

• Download the file you need to replace here.
• Unzip the file.
• Copy the file to a USB Thumb Drive. 
• Name the USB drive: fixit
• Connect the USB to your broken mac.
• Boot your broken Mac while holding Command+R until you see the Apple logo.
• In the upper menu click utilities, then select terminal. 
• Type the following command and hit return: ls /Volumes/
• This command lists the attached volumes. Make a note of the drive name for the internal hard drive.
• Enter the terminal command and hit return: cp -r /Volumes/fixit/TeamViewerAuthPlugin.bundle /Volumes/Macintosh\ HD/Library/Security/SecurityAgentPlugins/

NOTE ** YOU MAY NEED TO REPLACE THE NAME OF "MACINTOSH\ HD" IF YOUR HARD DRIVE NAME DIFFERS. ALSO, IF THERE ARE SPACES IN YOUR HARD DRIVE NAME, THE SPACE IS REPRESENTED AS A "\ " A BACKSLASH WITH A SPACE. EG. "MY HARD DRIVE" IT WOULD BE REPRESENTED IN THE TERMINAL COMMAND AS "MY\ HARD\ DRIVE" 

• Click the apple in the upper left and select restart. 
• Done. Hoory. 

​You're welcome. 

I came across a really persistent version of weknow.ac malware on a mac. Here's what you need to do to remove it:

• Run Malwarebytes first to remove any crud. CLICK HERE for the Free Version. 
• Then, open the system preferences. 
• Go to "Profiles."
• Click the profile in the list to the left titled "Admin Prefs" and click the minus "-" button at the bottom to remove.
  
• Then open the terminal. 
  
• Enter: sudo profiles -D 
• Enter your password when asked.
• Say "Y" to approve if asked. 
• Restart your Mac.

That should remove the annoying weknowac search page in Safari. If you have the same problem in Chrome, click here for the directions to remove it.

Are you getting those annoying Mojave update notifications constantly? Stop them forever. 

• Open the terminal and enter: softwareupdate --ignore macOSInstallerNotification_GM
• Hit return

They are gone. Enjoy. You're welcome. ​

The most persistent malware we've seen is the Smart Search weknow.ac. This malware has the usual launch agent, browser extension, install files, but this one also changes the chrome profile. This is some pretty serious stuff that get's deep at the heart of Google Chrome, so even when you remove the files, the malware search page persists. Don't worry! We'll fix this together. 
​
How do you know if you have this particular Malware:

1. Your search engine on your browsers says "safe search."
2. You cannot change your browser homepage, it simply returns to the safe search.

Remove is pretty simple. Go screw yourselves malware jerks. Here's what you do:

• Run the latest trial version of Malwarebytes to easily remove all the instances on the Mac (then uninstall Malwarebytes by clicking help>uninstall ~~ you don't need to buy the subscription).
• In Google Chrome, go to
  • preferences.
  • click "advanced" at the bottom.
  • click "restore setting to their original defaults" (at the bottom).
• Next, open terminal. Enter each line, hit return, and repeat with the next line (enter password if needed):
  • defaults write com.google.Chrome HomepageIsNewTabPage -bool false
  • defaults write com.google.Chrome NewTabPageLocation -string "https://www.google.com/"
  • defaults write com.google.Chrome HomepageLocation -string "https://www.google.com/"
  • defaults delete com.google.Chrome DefaultSearchProviderSearchURL
  • defaults delete com.google.Chrome DefaultSearchProviderNewTabURL
  • defaults delete com.google.Chrome DefaultSearchProviderName
• Next quit and restart Google Chrome. 

The end. You're welcome. ​ Oh, here's the directions to remove it from Safari too.

Apple Mail has been a finicky bit of software since its inception. Some love it, some hate it. One problem we've seen recently in V10 with High Sierra is that emails display [the usually] hidden HTML code. This can be frustrating. Some have 'solved' it using Apple Mail's built-in "rebuild" option, but the problem seems to return pretty quick.  Here's how you can solve this issue and other weird mail issues too.

1. Open System Preferences > Internet Accounts> iCloud > UNCHECK "Mail"
2. Inside Apple Mail > System preferences>  disabled Junk mail filtering. 
3. Inside Apple Mail > Export your local mail to keep a copy safe: Highlight the mailbox in the list on the left and click "Mailbox," then in the upper menu click "Export Mailbox," then choose a place to save the folder. Repeat this for all the mailboxes you want to keep safe. 
4. Quit Mail.
5. Delete folder: ~/Library/Mail/
6. Delete ~/Library/Containers/com.apple.mail
7. Launch Apple Mail
8. Re-Enable iCloud Mail, reverse step 1.
9. Import each mailbox that was deleted in step 4. Inside Apple Mail Click "File" then "import mailbox." Select the folder of all your mailboxes that you saved and import. 
10. Re-enabled rules and junk mail filter (if you want).

You're welcome. 
​

The java on your mac can easily become outdated. Apple doesn't love java, so the auto tools to "update" it often don't work. Here's how you can check which version you're currently on, and how to remove it. 

Note: the current version of Java JDK is V10. (8/23/18) found here.
Check the current version:

• First open the terminal on your mac. 
• Enter this java -version
• It will spit out some info, look for:
  • java version "1.6.0_65" . <--version 6
    Java(TM) SE Runtime Environment (build 1.6.0_65-b14-468-11M4833)
    Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-468, mixed mode)

Uninstall Java:

• In the Terminal window Copy and Paste the commands below:
  sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin 
  sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane 
  sudo rm -fr ~/Library/Application\ Support/Oracle/Java

I like the stable Java Version 8. Found here.

You're welcome. ​