How to download Tortoise SVN 'Show Log' info into a file

This is a built-in feature of TortoiseSVN:

1. Right click the folder and choose the "Show Log" command
2. Shift-click all of the revisions you need
3. Right-click and choose "Copy to clipboard"

Then, just paste into your favorite text editor.

Or use command line:

svn log -v > branch.log