versions of perl that have this feature enable or usable

The Postfix Dereference Syntax is enabled by default in Perl 5.24 and above. E.g. on v5.26:

$ perl -wMstrict -e' my $q="qwer"; my @a=(\$q); print $a[0]->$*,"\n";'
qwer
[download]

However, if you want it to interpolate in strings, you do need to enable the postderef_qq feature, for example via the v5.24 feature bundle ("use 5.024;"):

$ perl -wM5.024 -e' my $q="qwer"; my @a=(\$q); print "$a[0]->$*\n";'
qwer
[download]