Odd, in Kali Linux 2019.4 Zenmap appears to be missing. If I try and install it i get the following:
apt-get install zenmap
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package zenmap is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
ndiff


E: Package 'zenmap' has no installation candidate


thanks in advance,
GMF