Right-click the file and choose Open File Location (repeat these steps for all instances in Task Manager). Open the task manager, go to the Details tab and find instup.exe there. To determine the authenticity of the Instup.exe file, you need to verify its location and digital signature. Therefore, you can find the program file instup.exe in the cc manager and it can consume a certain amount of CPU resources. However, there is evidence that Avast updates its virus definitions more than 100 times a day, as it uses 'Streaming Update' technology to immediately send updates to users. Thus, it practically does not consume system resources.
The program runs in the background only during the installation of virus definitions and software updates. This file then helps keep virus definitions up to date and thus keeps Avast up to date on your device. This process installs the antivirus software. Instup.exe is the 'Avast Antivirus Installer'.