I literally installed the app similar cleaner app , by deleting from launchpad it was completely deleted from the Mac , and after that searched all the remnants of it in system library and user library folders nothing was there inside it .Launchpad can be directly opened by pinching on trackpad , there is no need to force restart the Mac .
See these steps .
Go to system preferences and click on users and groups open the pad lock by entering admin name and password ( in case if it is an admin account ) , select login items , if you see app select it and click on minus sign to get deleted .
In system preferences itself click on Security and privacy , click on Accessibility then privacy select the suspicious app click on minus sign to get deleted .
Click on finder and search in Applications and download folder .
The next step would be enter in System Library .
Click on Finder , take cursor on top menu bar click on Go - Computer - Macintosh HD - Library
You have to manually search app in some folders where they reside .
1.Application Support
2.Caches
3.LaunchAgents
4.LaunchDaemons
5.Logs
6.PriviledgedHelperTools
7.Startup-items
8.Receipts
9.Preferences - the plist of app is to be removed , if there is com.apple .xxxx .plist it could also be com.apple.xxx.plist
10.Extensions
11.Frameworks
12.internet Plug -ins
13.Input Methods
14.ScriptingAdditions
Then enter in User library ( click on finder and take cursor on top menu bar , hold option key and click on library ) .
Search in folders
1.Application Support
2.Caches
3.Cookies
4.Safari
5.Logs
6.Saved Application State
7.LaunchAgents
8.Internet Plug -ins
9.Input Methods
10.Preferences - com.apple.xxx.plist .
11.Containers are also to be checked .
Then again click on Finder - Go - Macintosh HD - System - Library - Frameworks - search the app remnants in Framework folder .
Right click on remnants from the above folders and move to the trash bin , restart the computer and empty the trash .