Install program from mapped drive

I've working with a small network. 2 PC's that are both Vista home premium 64-bit. I'm trying to install a program from a mapped drive. I've got the drive mapped properly, there are no problems with permissions. When I run the install, (m:\install\setup.exe) I can select the various options, then tell it to install. Once it starts the install, it errors out saying invalid path. It then shows the UNC name, instead of just the drive letter. The knowledge base for the program I'm trying to install (Amicus Attorney 5) says it's a problem of the drive mapping; like you're trying to run the install without having a drive mapped.

Is this a Vista issue, or is it a problem with the installer? The installer won't complete because of the UNC path instead of the drive letter...
jjnjerAsked:
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authen-techCommented:
Why not just copy the files to the local computer and run the install?  If it's looking for a datafile that you are sharing between two computers you can stick it on a share...but seems like this would work better if you installed directly from a folder on the desktop or something.
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shadowz85Commented:
That looks like quite an old version. Try running the install in compatibility mode. Right-click the setup file and select properties. Select the compatibility tab and choose which version of Windows you think will work best.
http://www.howtogeek.com/howto/windows-vista/using-windows-vista-compatibility-mode/
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jjnjerAuthor Commented:
@authen-tech: I've tried to copy the installation directory to a local folder, recreating the folder structure on the shared drive, and the installer recognizes that it's not being run from the shared folder.

@shadowz85: Your suggestion was great, but didn't change anything. It still ultimately gave me the error about an invalid path. I think my client is just going to have to pony up the $$$ for support to the latest version. (he's about 3 versions behind)

Thanks for both suggestions, I'm going to split the point up between you both, as you're the only persons to respond...
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JerDawgCommented:
Actually, the answer is to turn UAC off on Vista and Windows7.  It will then allow the installation to happen.  When Amicus is installed, "sunc" up and working, turn UAC back on.  Should work fine after that.
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itwarlordSenior Engineer/OwnerCommented:
Happened across this problem and in addition to the above, what finally solved it for me was to "Run as Administrator" from the network drive with UAC off.
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Windows Vista

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