i'm not able to get it to run... it keeps asking me to download c++ runtime that i already have
My only guess is that the c++ runtime you have is outdated or not the version that Unreal 4 needs to run on your PC. And you need to update/download and install the proper version.
well, that doesn't really work either. even when i have everything, it still returns the same exact error.
at one point, it said 2 specific dll files were missing. after that, i kept getting the runtime error.
You might need to do a google search on this cause missing DLL Files is a Windows problem.