The other day when I downloaded LW, afterwards, there was a pop-up about not enough disk space. I didn't know what it meant so I just closed it. Now I only have one green bar b/c of lack of disc space for LW. How do I check and free up disc space??

Go to LW's menu bar, Tools -> Options -> Saving, and choose a different partition to save your files to. Otherwise you will continue having this problem. Obviously your main drive (most likely drive C), does not have enough space. This is BAD for your system & general use of the computer & other programs. You really need to free up space on your C drive, defragment it at least every couple of weeks. A disk almost full will cause all types of problems with other programs & your system. Free up space before you get 'burnt' with major issues.

For LW, you obviously need a different drive or partition with plenty of space to download to. BTW large capacity hard disk drives are so cheap to buy nowadays ... go out & get a nice biggie.

FYI ... I try to keep my system drive just to itself. 1 Terrabyte drive 'mostly' just for the system to run the hills over (however I run Mac OSX). Only programs that demand to be installed on the system drive do I keep there. Everything else, programs, documents, personal files, work files, videos, images, music, etc. I keep on other hard disk drives. Less chance of drive or system complications whilst doing system objectives during synchronous reading & writing of 'other' files, etc.