https://ftp.ntu.edu.tw/cygwin/noarch/release/adobe-source-serif-pro-fonts/
Index of /cygwin/noarch/release/adobe-source-serif-pro-fonts/
source serif proindex ofcygwinnoarchrelease
https://mirrors.sohu.com/cygwin/noarch/release/adobe-source-serif-pro-fonts/font-adobe-sourceserifpro-ttf/?C=M&O=D
Index of /cygwin/noarch/release/adobe-source-serif-pro-fonts/font-adobe-sourceserifpro-ttf/
source serif pro
https://koschei.fedoraproject.org/package/adobe-source-serif-pro-fonts?collection=f42
Koschei - adobe-source-serif-pro-fonts
source serif proadobefonts