unable to install macOS

I will admit this is definitely my fault but is there anyway I can fix it? I cannot afford to buy a new computer and I really need one. There was a software on my computer that I needed to run and it would not run until I updated my computer since my computer had absolutely no storage available since I bought it secondhand, I tried to factory reset it myself erased the disk and all the data and my Mac shut down before I could install the OS on that screen and now when I try to install it, it just tells me the recovery server cannot be contacted. Is there anyway I can fix this? I have some important assignments due tonight and my computer is my only way of accessing them.