In most cases receiving an NSIS error from an installer indicates a corrupt download. If you receive this error while installing FL Studio or any other Image-Line products:
1. Redownload the installer from the Downloads page.
2. If the problem persists try the following:
a. Clear your browser's cache.
b. Disable any download accelerators or managers and download the installer again.
c. Update your anti-virus software (if installed) and download the installer again.
d. Disable your anti-virus software and download the installer again.
e. Download the installer using another computer and copy it to the original computer.
Image-Line Support Team