While "free download" links for Protonema Regular exist on third-party file-sharing sites, these are often unauthorized and potentially unsafe.
Protonema Regular Font Free Download !!INSTALL!! - Google Drive protonema regular font free free download
: The font includes numerals, scientific typesetting (fractions, subscripts, and superscripts), and various OpenType glyph variants. While "free download" links for Protonema Regular exist