[3] What is the latest PKZIP version?

The latest official DOS version is 2.04g. The latest command line version
for Windows 95 is 2.50. The latest Windows 95 version is 2.70.
See http://www.pkware.com for more information.

Be warned that there are countless bogus PKZIP 1.20, 2.0, 2.02, 3.00B,
3.05, 4.1 and whatever scams floating around.  They usually are hacks
of PKZIP 1.93A beta test version.  Some of them are trojans and / or
carry computer viruses.

Note about pkzip 2.06 from a PKware employee:

    Version 2.06 was released as an INTERNAL use only IBM version.
    It is identical to 2.04G, but it has IBM names in the help
    screens and such. That release is meant for IBM only.

If pkunzip indicates that you need version 2.8 to extract an
archive, your archive has been corrupted by a transfer not
made in binary mode (see item 30 below).