To Miroslav, about the archive files with extension .sit:
The archive files with the extention .sit are a nightmare! Above all for all the people using Windows or Linux.
AVOID the archives .sit files!!.
You compel to install a specific expander for these files which are in a proprietary format! The standard archive/unarchive tools are ALL incompatible with this proprietary format! And even worse, even the specific tool itself change its specifications from a version to another.
To unarchive .sit files, first you compel to install StuffIt Expander... that generally we have not on our systems. So we install this tool... but it's then necessary to know that the last version that expanded the .sit file was the 2010 version. Starting from the 2011 version... Stuffit expander expands only the .sitx version, no more the .sit version.
So you compel your readers to install Stuffit Expander 2010! Not the later versions.
And above all, whatever your operating system... use .zip files or .rar files to stay compatible with every body.
Even you Stuffit tool can create .zip and .rar files to stay compatible with everybody.
To avoid the bothering installation of this specific expander totally unnecessary in the daily use of our systems and so to give access to these four files to EVERYONE, some minutes ago I just reuploaded the four files in the universal standard format that everybody can read natively, the .zip format! And I have set the four files in a one package.