Thank you for posting on the Intel® communities.
As you know, the Intel® Core™ i7-4558U Processor is a mobile processor, therefore; the installation on your laptop completely depends on the manufacturer (OEM), in this case; Asus*.
I would strongly recommend checking with Asus* for more information about the thermal solution, design, and if the use of thermal paste is required to avoid any kind of overheating in your device. Also, to check if the thermal paste or other thermal component comes preinstalled.
I attach the following link where you can find your Computer Manufacturer Support Websites:
That being said, we consider that you would need direct assistance from your OEM. If you need any additional information, please submit a new question as this thread will no longer being monitored
Intel Customer Support Technician