Ok, here goes.
I tried using the terminal, but that wouldn’t let me. said something about constituting one disk of a multi-part archive. I kept searching for a way to fix my problem. I tried downloading zipeg and using that, but it didn’t work still. then i downloaded a new unarchiver called, ‘The Unarchiver’ i used that and it said:
could not extract the file “arduino-0015/hardware/tools/avr/man/man1/avr-ld.1”: The archive file is incomplete"
anyway, the program works, I loaded the file and started working. it works just fine. i’m wondering if the error could be a problem in the future. thanks phil for all your help.