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Editorial Team
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Asked: 2026-05-16T17:41:03+00:00

My setupper gives the ERROR access denied dialog when overwriting one DLL fails, its

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My setupper gives the ERROR access denied dialog when overwriting one DLL fails,
its locked&in use sometimes.

what is recommended procedure for doing this..

Can I somehow make INNO to compare if its even necessary to overwrite this DLL (size match?)

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  1. Editorial Team

    InnoSetup automatically compares the files to see if it needs to be replaced by looking at the version resource in the file.

    You should add the RestartReplace flag to the [Files] entry for your DLL (and any other file that might be in memory / locked). From the InnoSetup documentation:

    restartreplace

    When an existing file needs to be
    replaced, and it is in use (locked) by
    another running process, Setup will by
    default display an error message. This
    flag tells Setup to instead register
    the file to be replaced the next time
    the system is restarted (by calling
    MoveFileEx or by creating an entry in
    WININIT.INI). When this happens, the
    user will be prompted to restart their
    computer at the end of the
    installation process.

    To maintain compatibility with Windows
    95/98/Me, long filenames should not be
    used on entries with this flag. Only
    “8.3” filenames are supported.
    (Windows NT platforms do not have this
    limitation.)

    NOTE: This flag has no effect on
    Windows NT platforms if the user does
    not have administrative privileges.
    Therefore, when using this flag, it is
    recommended that you leave the
    PrivilegesRequired [Setup] section
    directive at the default setting of
    admin.

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