This article explains how to install a new version of your setup project using the Windows Installer update mechanism.
When you need to build a new version of your setup project or ship fixes to it, it’s tempting to rebuild the project and try to install the MSI file.
For example, if "Always ask me where to save files" is selected, select "Save files to" and choose a download folder, then go back and re-select "Always ask me where to save files".
 If you still have problems you can restore the default Firefox download folder settings as follows: Enter about:config in the address bar. Scroll through the list ( or type browser.download in the Filter box) and reset any of the following preferences that have a user set status (right-click on the preference and click "Reset"): You can then change back to your preferred download folder settings, if you wish, in your Firefox options/preferences. To fix this problem on Mac OS X 10.4 and earlier, open Safari Preferences and check the "Save downloaded files to:" setting.
Instead of choosing a download folder you can try resetting the browser.Dir preference in about:config (see below).
Save Page As" and the "Save Image As" and "Save Link As" right-click context menu options not functioning or nothing downloading when you select the "Save" option in the Firefox "Opening" dialog box   The solution may be as simple as choosing a different download folder, then going back and re-selecting your preferred download settings in Firefox Tools - Options under "General / Downloads" ("Main / Downloads" in Firefox 3.5).
For example, you are required to authenticate your identity and purpose when crossing international borders or completing business transactions.