Why do some still use InstallShield? Is there any advantages compared to NSIS or is it just that their software is commercial so they do not want to use NSIS?
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Well, maybe, They don't know NSIS??? Or never heard of it?
usually the main reason is that NSIS Based installers are used by people that are made by Virus makers and usually as in the case of the PortableApps.com Project we get false positives from Virus Scanners. So what other companies do to avoid the trouble is that they use something else.
your friendly neighbourhood moderator Zach Thibeau