These versions are designed for embedding on web sites. To keep them as small as possible, they lack most of the symbols.

They contain some OpenType features: Standard Ligatures, Discretionary Ligatures, Historical Ligatures, Ordinals, Superscripts, Scientific Inferiors, Subscripts, Tabular Figures, OldStyle Figures, Standard Fractions, and Kerning.

The WOFF (Web Open Font Format) versions are the same as the OpenType Web versions, but compressed. The disadvantage is that they cannot be installed in Windows and cannot be embedded automatically using Serif WebPlus X8.  You will need to add suitable @FontFace code manually to make use of them.