A:AnswerIt's probably the fan that you're hearing, since the SSD in this computer has no moving parts. If the noise is objectionable, contact the HP support team to see if there's a hardware or configuration issue.
A:AnswerElgato does not recommend using a processor with a "U" suffix (like this computer's i7-8550U). However, it looks like it might be an older document, so that may not apply to the 8th generation Intel processors. Your best bet would be to contact Elgato directly to see if their recommendation holds true for the newer processors.
A:AnswerYes, this laptop can support. Windows 10 Pro. You can either upgrade through the Microsoft Store on the laptop or by buying the upgrade from Best Buy.