Installing new wodUpdSv.exe with Installshield (General questions)

I feel I'm the only one reporting problems on the forum, since the last 2 topics were all from me, and here I go again.
I might have encountered a bug with wodAppUpdate. When using Installshield, I added the wodUpdSv.exe inside the project, put it in the [System] folder, and registered it as a service (all inside Installshield). The service also appears to be running. When I try to update some files (without an Administrator access), the files are downloaded, but aren't updated. The CMDAFTER command is executed afterward. Each time I check for updates, the same files are downloaded, but they are still not updated, and CMDAFTER is executed. If I do the same thing, but with admin privilege, everything works great.

Did I miss a setting in Installshield? Must I specify the name of the NT Services in a specific way?