To the latest version. It is pretty easy to follow the simple upgrading instructions with a few catches:
- I customized the default theme to add header picture, random photo and XML links, have to remember to copy those back from the backup of the old site (the files get overwritten);
- Any other changes to the default files – so it’s a good idea to keep all the files in the old version in, just rename the top folder before you unpack the new version.
You can actually have both old and new versions up at the same time, just in case you find the new version missing some files, you can still copy them from the old version.