Q: issues downloading on my macbook osx..

Hello, Bakays. 

Thank you for visiting Apple Support Communities. 

You may be having a permissions issue with that folder; check them to make sure you have write privileges for your downloads folder. 

Troubleshooting permissions issues in Mac OS X

http://support.apple.com/kb/HT2963

If the issue persists, you may need to perform an archive an install of your OS. 

OS X Lion: Reinstall Mac OS X

http://support.apple.com/kb/PH3878

Cheers,

Jason H.