2
I dont know if there have been any database changes between 2.0.6 and 2.0.13 but for the files you could :
1 - download all the patches.
2 - extract them all to the same location starting at 2.0.6 and working your way up to 2.0.13
3 - upload what you have created.
Greetings Highlander
p.s. personally I would do the updates one-by-one checking the website for errors as I go. However I cant see anything wrong with my suggested solution IF you extract in the right order.
p.p.s. beware of any db changes there might have been between 2.0.6 and 2.0.13 (I havent even been using XOOPS that long
)