Hello nootkan, first off if you not already have installed it, pls overwrite the install folder with the attached zip. Lately there has been been quite a few issues on some hosters provider and this update is not yet included in the download you have.
Just read through the user's manual where it states to overwrite the existing files with the exception of the settings_sql.php file. Can I not also delete all the existing files except settings_sql.php
settings_sql.php have not changed, plus you need it so the installer knows there is something to update in your database ( has to make a connection after all )
As for suEXEC, got myself no experience with it, but just visit the install page. It will give you the information you need.
If there is a red mark for anything, for example a message about banner directory not writeable, then go ahead and do a chmod 777 ( also stated there ) on that folder.
If all is green, go ahead and proceed with install
The chmod info on our doc page also became obsolete since a bit. Lately some hoster have integrated some odd security when running suPHP/fastCGI ( not sure if same is with suEXEC ) and you still chmod files ( which isnt needed on these handlers ), they spit out 500 internal server error, telling you chmod is not needed. Before if you chmod or not did not matter on these, dont know why some have changed that, seems odd.
So, if you just follow the green mark on the install page, you should be good to go. Our doc page really needs some love
And dont forget your aardvark database and file backup in case anything goes wrong
If errors show up, please feel to post here