Hey, 

I have download speed issues from the beggining of purchasing this adapter... I have an 500Mbps net . 

Im stuck with 10-11mb download speed even when the TP link (tpPLC) utility shows that I have 300+ Mbps speed from the first adapter. ( which should be fine with a gigabit adapter but with an avarage 37-38mb download speed what it should make)

I live in a storeyed house on the upper floor where my second adapter and my pc are connected . Downstairs , there are my router and the first adapter . The distance between the 2 adapter should be like 30 meter . Im not getting more than 11MB download speed .

Is there something that I can do , check if I could improve my download speed which is awful? 

Thanks in advance.