For me the installer worked just fine. I was able to install OpenACS (automatic) then log in to the service. From there I tried to install forums and got the following error:
[21/Dec/2005:13:04:20][2360.3304][-conn:openacs-5.1.5::1] Error: Error loading APM file form url https://openacs.org/repository/5-1/attachments-0.10.apm: couldn't execute "gunzip": no such file or directory
couldn't execute "gunzip": no such file or directory
while executing
"::exec_orig gunzip -q -c C:/WINNT/TEMP/AOLD8.tmp.apm | tar tf - 2>nul"
("eval" body line 1)
invoked from within
"eval $cmd"
(procedure "exec" line 17)
invoked from within
"exec [apm_gunzip_cmd] -q -c $file_path | [apm_tar_cmd] tf - 2>/dev/null"
[21/Dec/2005:13:04:20][2360.3304][-conn:openacs-5.1.5::1] Error: Error downloading package attachments from https://openacs.org/repository/5-1/attachments-0.10.apm. Installing package failed.
[21/Dec/2005:13:04:20][2360.3304][-conn:openacs-5.1.5::1] Notice: Installing forums
[21/Dec/2005:13:04:20][2360.3304][-conn:openacs-5.1.5::1] Notice:
Downloading https://openacs.org/repository/5-1/forums-1.1.2d5.apm...
[21/Dec/2005:13:04:21][2360.3304][-conn:openacs-5.1.5::1] Notice: The follow error occured during the uncompression process:
couldn't execute "gunzip": no such file or directory
[21/Dec/2005:13:04:21][2360.3304][-conn:openacs-5.1.5::1] Error: Error loading APM file form url https://openacs.org/repository/5-1/forums-1.1.2d5.apm: couldn't execute "gunzip": no such file or directory
couldn't execute "gunzip": no such file or directory
while executing
"::exec_orig gunzip -q -c C:/WINNT/TEMP/AOLD9.tmp.apm | tar tf - 2>nul"
("eval" body line 1)
invoked from within
"eval $cmd"
(procedure "exec" line 17)
invoked from within
"exec [apm_gunzip_cmd] -q -c $file_path | [apm_tar_cmd] tf - 2>/dev/null"
[21/Dec/2005:13:04:21][2360.3304][-conn:openacs-5.1.5::1] Error: Error downloading package forums from https://openacs.org/repository/5-1/forums-1.1.2d5.apm. Installing package failed.
It appears the apm_gunzip_cmd is not returning the correct path to gzunzip. I am guessing it should be included in the cygwin install.
apm_gunzip_cmd just returns the string "gunzip" so the C:\OpenACS\Cygwin\bin directory must be setup in the path when AOLserver is run.
I host this information is useful. Let me know if you need any additional information.