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Disallow updating of an existing installation #9

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Disallow updating of an existing installation #9

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19 changes: 19 additions & 0 deletions FreenetInstall_InnoSetup.iss
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Original file line number Diff line number Diff line change
Expand Up @@ -300,3 +300,22 @@ begin
if (PageID = JavaDependency.Page.ID) And fCheckJavaInstall() then Result := True;
if (PageID = NetDependency.Page.ID) And IsNetInstalled() then Result := True;
end;

function IsFreenetInstalled(): Boolean;
var
RegPath: String;
begin
Result := False;
RegPath := ExpandConstant('Software\Microsoft\Windows\CurrentVersion\Uninstall\{#emit SetupSetting("AppId")}_is1');
if RegValueExists(HKLM, RegPath, 'UninstallString') or RegValueExists(HKCU, RegPath, 'UninstallString')
then Result := True;
end;

function InitializeSetup(): Boolean;
begin
Result := True;
if (IsFreenetInstalled()) then begin
Result := False;
MsgBox(CustomMessage('FreenetAlreadyInstalled'), mbCriticalError, MB_OK);
end;
end;
1 change: 1 addition & 0 deletions translations/Messages_en.isl
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Expand Up @@ -8,6 +8,7 @@ DependencyInstalled=%1 has been installed on your system.
ErrorLaunchDependencyInstaller=Can't launch %1 installer.%n%nError (%2): %3.
AdditionalOptions=Additional options:
StartFreenetWithWindows=Start Freenet when I log in to Windows
FreenetAlreadyInstalled=An existing Freenet installation is found. This installer cannot be used to update Freenet to a newer version. To update, enable Freenet's built-in automatic updates or run 'update.cmd' from the installation directory. To re-install, please uninstall Freenet first.

[Messages]
WelcomeLabel2=This will install [name/ver] on your computer.
1 change: 1 addition & 0 deletions translations/Messages_en_utf8.isl
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ DependencyInstalled=%1 has been installed on your system.
ErrorLaunchDependencyInstaller=Can't launch %1 installer.%n%nError (%2): %3.
AdditionalOptions=Additional options:
StartFreenetWithWindows=Start Freenet when I log in to Windows
FreenetAlreadyInstalled=An existing Freenet installation is found. This installer cannot be used to update Freenet to a newer version. To update, enable Freenet's built-in automatic updates or run 'update.cmd' from the installation directory. To re-install, please uninstall Freenet first.

[Messages]
WelcomeLabel2=This will install [name/ver] on your computer.