Problem installing Self 4.4 on Snow Leopard

[sxyzh2]

Dear All

Two colleagues and myself are getting the same problem installing Self 4.4 on Snow Leopard (in my case 10.6.8).

Any tips gratefully received.

1. The Mac OSX Self-4.4.pkg installer runs apparently OK.
2. The Self VM and Droplet are duly installed in /Library/Self/0/
3. However, there is no sign of the shell script in /usr/bin/Self.

4. By using su (administrative permission is not enough) one can copy Clean-4.4.snap to /Library/Self/0/SelfDroplet.app and mark it as executable
like so.

bash-3.2# cd SelfDroplet.app
	bash-3.2# ls -al
	total 8992
	drwxr-xr-x  4 admin  501        136 14 Feb 18:18 .
	drwx------  4 admin  wheel      136  9 Feb 23:19 ..
	-rw-r--r--@ 1 root   501    4600436 14 Feb 18:18 Clean-4.4.snap
	drwxr-xr-x  6 admin  501        204 14 Feb 17:32 Contents

	bash-3.2# chmod u+x  Clean-4.4.snap

	bash-3.2# ls -al
	total 8992
	drwxr-xr-x  4 admin  501        136 14 Feb 18:18 .
	drwx------  4 admin  wheel      136  9 Feb 23:19 ..
	-rwxr--r--@ 1 root   501    4600436 14 Feb 18:18 Clean-4.4.snap
	drwxr-xr-x  6 admin  501        204 14 Feb 17:32 Contents
	bash-3.2#

5. After which the command
open Clean-4.4.snap
causes an OS X dialog box  to appear which says something like
"are you sure you want to run this application downloaded from the internet?"
But then the launch fails with error 10810 in the terminal window.

6.Tried numerous other things but nothing works.

Any tips gratefully received.
Many thanks