Answer:
Set a restore point, confirm system compatibility and turn off the system firewall.
Explanation:
The computer system is divided into hardware and software. The software includes the operating system software that manages the system functionality and application software that comes with the operating system or manually installed by the client.
Manually installed applications from unknown websites can sometimes introduce malicious software like rootkit, Trojan horse and virus to the system which are harmful.
To prevent this, set a restore point, so to be able to revert the installation if it is harmful and allow firewall access for proper installation.