https://www.ctan.org/ctan-ann/id/Pine.LNX.4.64.0603271619120.7405@bk-ng-05.proteosys
CTAN: CTAN-ann - CTAN has a new package: showexpl
a newctanannpackage
https://yum.oracle.com/repowatch/oraclelinux7.x86_64/ol7_u1_base/5d2ff3e5adbfeceb02df42748094ca0889681a94
[ol7_u1_base] texlive-showexpl
basetexlive