Depends on what you mean by "older version".
The Debian package pepperflashplugin-nonfree is designed to always extract the
player from the newest Chrome package (within stable, beta or unstable). The
Debian package pepperflashplugin-nonfree as-is does not support reverting to an
older player. Going back to an older pepperflashplugin-nonfree won't help.
However, you may have older Chrome packages still in
/var/cache/pepperflashplugin-nonfree so then you can manually extract the
player from an old Chrome package and install that player manually.
Regards,
Bart Martens