I can confirm that you MUST install each update from 1.05 on ward. You can find and install from 1.01 but it's not necessary.
A word of caution though. Backup your save game before you do anything because there is a chance it'll be corrupted after the 1.07 update and you get an "insufficient space" message.
If that happens, you can re-install up to 1.06 and play happily. All the major improvements are included in that update.
Now, if only someone can hack 1.10 because that has the save feature for the endurance races!!
"We all agree your theory is crazy, but is it crazy enough?" - Neils Bohr