Error when launching installer from network path

[Satara]

Hi,

one of our customers complained that our installer is not startable from a network path. His error message was: "Error launching installer".

I myself wasn't able to reproduce this, neither on Windows 7 nor on Windows 8.1. But now a colleague gets a similiar problem on Windows 8.1 Pro.
When he tries to launch the installer from a network or unc drive he gets the message "Falscher Parameter" (Wrong Argument). Not sure if this is the german equivalent for "Error launching installer".

I already read on http://nsis.sourceforge.net/Why_do_I_get_NSIS_Error that this can happen, if the installer is started from a "forbidden location", but the examples listed there work fine for me (e.g. Windows, Program Files folder). My colleague also tried to launch the installer with the NCRC option, but the result was the same.

Does anyone know what is causing this problem?

Best,
Satara