Postgres 9.4.4/9.4.6: plpython2/3 intallation issues on a Windows 7 machine

I installed postgres 9.4.6 on my Windows 7 (64-bit) machine, and managed to
create the plpython3u extension without a problem.

I then restored an existing DB (created in postgres 9.3). The plpython3
functions restored without a hitch and can execute.

However, as soon as I try to create a NEW plpython3 function on the db the
postgres service terminates and does an auto-recovery.

I then downgraded to postgres 9.4.4 and am still encountering the same
issue.

Example:

When running the following code:

"create function test() returns void as $$ plpy.notice( 'xxx' ); $$ language
plpython3u"

the following is generated in the log:

"
2016-03-31 09:36:56 CAT LOG: server process (PID 6376) exited with exit
code 3
2016-03-31 09:36:56 CAT DETAIL: Failed process was running: create
function test() returns void as $$ plpy.notice( 'xxx' ); $$ language
plpython3u
2016-03-31 09:36:56 CAT LOG: terminating any other active server processes
2016-03-31 09:36:56 CAT WARNING: terminating connection because of crash of
another server process
2016-03-31 09:36:56 CAT DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit, because another
server process exited abnormally and possibly corrupted shared memory.
2016-03-31 09:36:56 CAT HINT: In a moment you should be able to reconnect
to the database and repeat your command.
2016-03-31 09:36:56 CAT WARNING: terminating connection because of crash of
another server process
2016-03-31 09:36:56 CAT DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit, because another
server process exited abnormally and possibly corrupted shared memory.
2016-03-31 09:36:56 CAT HINT: In a moment you should be able to reconnect
to the database and repeat your command.
2016-03-31 09:36:56 CAT WARNING: terminating connection because of crash of
another server process
2016-03-31 09:36:56 CAT DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit, because another
server process exited abnormally and possibly corrupted shared memory.
2016-03-31 09:36:56 CAT HINT: In a moment you should be able to reconnect
to the database and repeat your command.

"

I am guessing that my problem might have something to do with the fact that
the plpython2u language is not installed on the DB - although I am not sure
why it should it need it, when executing a plpython3 command. As I
understand it, Postgres 9.4 accomodates both versions of python. However I
have not been able to figure out how to load plpython2u onto the db. The
postgres version I installed does not ship with plpython2.dll and I have not
been able to get hold of a copy. ( Python 2.7 /3.2 and 3.3 are installed on
my machine, and I am running postgre versions 9.2, 9.3 and 9.4.4 on
different ports).

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