Upgrading is pretty easy you do NOT have to run an install script or so just copy over the files.
By the way:
note that config.php has only been included for your reference
the config was NOT included in the sr3 pack but is also not necessary.
One question is left:
What surprised me was
When upgrading from an earlier 1.3.11 release, please apply _all_ the previous upgrades first, in the following order:
1.3.11sr1 -> Spam-X plugin 1.0.2 -> 1.3.11sr2 -> 1.3.11sr3
I never paid much attention to Spam-X plugin 1.0.2 and definitely didn`t install it by hand. If I look at the plugins it says: spamx 1.0.1 / 1.0.2. It should be o.k. then?