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    <p>Based on the code snippet you linked to I think that you have no need to worry.</p> <p>The .onInit function is executed prior to the installer UI being drawn on the screen, hence the uninstaller is going to be run before the user even has a chance to interact with the installer.</p> <p>Just to make sure you are correctly understanding what that code is doing, when you run the new installer it is looking in the Registry to find the location of the Uninstaller executable of the old version, then popping a message box asking if you would like to uninstall the previous version. If you click ok then it will execute the uninstaller using the ExecWait instruction which will prevent the next instruction from being executed until the uninstaller returns (finishes). If the user clicks cancel it will then skip the uninstall of the old version.</p> <p>Because all of this is done in the .onInit function, the User has no chance to interact with the new version before the old version is uninstalled.</p> <p>The only way they could install the new version prior to uninstalling the old version is if they click on cancel when the messagebox comes up. If you would like to remove this option then you could change the MessageBox code too:</p> <pre><code>MessageBox MB_OK|MB_ICONEXCLAMATION \ "${PROGRAM_NAME} is already installed. $\n$\nClick `OK` to remove the \ previous version" </code></pre> <p>You also need to remove the <code>IDOK uninst</code> and <code>Abort</code> lines following the MessageBox instruction.</p> <p>Hope this helps.</p> <p>The Basic format of your script should be:</p> <pre><code>Function .onInit code you linked to goes here FunctionEnd Section "Install" install stuff goes here SectionEnd Section "Uninstall" Uninstall stuff goes here SectionEnd </code></pre>
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    1. PONSIS uninstall and install active at the same time
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    1. COI just wrote a little test script and it seemed to work as I would expect for me. Make SURE that you have the code that you linked to in your original question inside the .onInit function. Edited my answer to try to make this clear.
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    2. COThe code I have is identical with the link, with the exception of "_?=$INSTDIR' ;Do not copy the uninstaller to a temp file"
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    3. COWell without seeing your code, I can't really help you much beyond what I have already posted. The code in the link works perfectly for me. The message box pops up and the installer window does not even appear until I have selected ok and the uninstaller is finished running.
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