1) From work folder:
Check the work folder defined in the parameter DIR_HOME
sappfpar pf=sapwebdisp.pfl DIR_HOME
2) From Web Admin UI interface
You can access the the Admin Interface based in the URL of parameter icm/HTTP/admin_0.
In the following example it should be (authentication required):
http://<hostname>/sap/wdisp/admin
icm/HTTP/admin_0 = PREFIX=/sap/wdisp/admin, DOCROOT=./admin,AUTHFILE=icmauth.txt
3) From Web Admin UI directly URL
Based in the example 2, calling the direct URL:
http://<hostname>/sap/wdisp/admin/download