Reexecute the installation from the uninstall section NSIS

Question

I have a NSIS code that install a program , in .onInit I check if an older version did exist and uninstall it if the user click on OK button, I want that once the uninstallation finish the installation re execute again, I try to call .onInit in un.onUninstSuccess function but it didn't accept it since un. function accepts only un. function. Any idea will be appreciated.

Answer 1

This is not the way to do. When you start the uninstaller, you start another process (typically uninstall.exe ) so you cannot just jump from it to the installer.

What you can do is:

• check if the previous version is present
• if so, start its unistall.exe while waiting for the subprocess to complete
• once you are back in the installer, continue your installation

A usual way to call the uninstaller from the setup is

ExecWait '"$INSTDIR\uninstaller.exe" /S _?=$INSTDIR'

Answer 2

可能不是最干净的解决方案，但是nsis Wiki上有一个组合的un / installer示例