Here's how to Stop Windows 10 Upgrade Assistant from reinstalling itself without your permission.
First off, back up your personal data, then: Assure you're not running Windows 10 Upgrade Assistant. Uninstall the app from the apps or programs list as usual. Now, you need to do the following steps: 1. Find out the following 2 folders: UpdateAssistant, and UpdateAssistantV2 - they be saved in the Windows folder. Then, try deleting 'em under Windows Safe Mode (here's how@ goo.gl/5QN2af ). 2. Open the hard drive where your Windows 10 is currently installed, try locating & deleting the Windows10Upgrade folder under Windows Safe Mode.
Other voices on the web: 1. Click your Start Button, type Task Scheduler and hit enter. In the left Pane, navigate to: Windows - Update Orchestrater. Right Pane double click 'Update Assistant' . Click on Triggers Tab . On each of the triggers ( At login . . . etc.) double click and uncheck 'Enabled' . Under 'Update Assistant, there is another event 'Update Assistant CalendarRun' . Do the same for all triggers on that event . Then you could change the group policy and modify registry to set the automatic update (Here's how@ bit.ly/2EiWSZ1 "How to configure automatic updates by using Group Policy or registry settings?".). 2. set Windows Firewall policy to prevent Upgrade Assistant download updates.
you may get some tips from bit.ly/2EiVNAh "Deploying Windows Firewall Settings With Group Policy".
If the same problem keeps reoccurring, you may need to try Press win + R to open run prompt. Type appwiz.cpl, and hit Enter. then select Windows Upgrade Assistant. Click Uninstall on the command bar. Additionally, please try these steps and see if they help.