MacBook 2010 wont install macOS high sierra

So I just replaced the SSD on my 2010 15" MacBook Pro and I cannot seem to install macOS high sierra and it just says it "cant reach the server". I checked everything even for flaws in partitioning/format of the SSD or wifi issues.

Maybe my MacBook is just too outdated or macos just isnt on the apple servers anymore.

if thats the case can anyone tell me where I can get an offline installer that doesnt require an OS already installed.

I also cant boot anything external for example a USB-drive with Windows ISOs on VenToy just wont start at all

I have no idea what to do