Sublime Text

If you are on a mac, find the file in finder and right click and then select get info and then change permissions at the bottom. from "read only" to read & write.

should be something along those lines as well if you are on a pc.

Awkward seems to be happening to a number of people, mines seems to working fine, you can try downloading Sublime Text 3 Beta here: http://www.sublimetext.com/3 I've been using it and is working great !

If you're using a Mac you can modify the permissions on a file by going to the file in the Finder, right clicking (command + click) on that file and choosing Get Info. In the dialog that appears you will see at the bottom a section where you can modify Sharing & Permissions. There will be a small table of users and the permission settings in the adjacent cell. Find the user account you're using and make sure the permissions that are set to "Read & Write".

Permissions can also be set at the directory (folder) level too so it's possible that you might have to modify the permissions of the folder which that file is in. You will want to look for this only if you're finding that you're unable to save any of the files in a directory.

According to a message just received Subline indicates the download is free but to continue I need to buy it for $70. Is that correct? No mention in the corse video about buying the program.

Yeah, it wont stop you from using it , but a license is required, if you want something completely free, you can download something like Adobe Edge code, but overall sublime is the simplest editor to use.