I just had to:
# rm /tmp/ISPConfig-3-stable.tar.gz
# rm -rf /tmp/ispconfig3_install
Is this a "bug"?
Shouldn't the install script either a) use pseudo-random names for the downloaded archive and the extraction destination (at least for part of the names, to ensure uniqueness), or b) overwrite/delete any file/directory that already exists?
It seems as though using the same names on every attempt to execute "ispconfig_update.sh" is error-prone (at least where the extraction destination directory is concerned).