With the current installer it is not possible to install JabRef without admin permissions. This restriction is not needed. I'm the author of your Windows installer script, so hereby I provide a changed script that allows it.
I attached the changed installer script.
improved installer script
Applied in JabRef 2.9 beta 2. Let's see, how it works out.
We shipped the 2.9b2 version using the old setup.nsi file, because there were some errors I couldn't figure out:
First I got this one:
!define: "VERSION" already defined!
After commenting out that line, I got the following:
!include: could not find: "fileassoc.nsh"
On Win7, I'm not asked for admin privileges.
Wow, I got a reply after 5 years. Things have changed a lot in the meantime, but I will have a look at the installer again this weekend.
I think, the current installer works without admin permissions, doesn't it?