[Dodakaedr]

Либо сделать отдельную функцию, которая вызовет и CreateBackup, и ChangeCaption. »

можете это в коде показать?
Реализация функции CreateBackup

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Код:

procedure CreateBackup;
var
srcFile, destFile: string;
begin
srcFile:= ExpandConstant(CurrentFileName);
destFile:= srcFile + '.bak';
DeleteFile(destFile);
RenameFile(srcFile, destFile);
end;

procedure RestoreBackup(backupDir: string);
var
srcFile, destFile: string;
FSR, DSR: TFindRec;
FindResult: Boolean;
APath: string;
begin
APath := AddBackslash(backupDir);
FindResult := FindFirst(APath + '*.bak', FSR);
try
while FindResult do
begin
if FSR.Attributes and FILE_ATTRIBUTE_DIRECTORY = 0 then
begin
srcFile:= APath + FSR.Name;
destFile:= Copy(srcFile, 0, Length(srcFile)-4);
DeleteFile(destFile);
RenameFile(srcFile, destFile);
end;
FindResult := FindNext(FSR);
end;
FindResult := FindFirst(APath + '*.*', DSR);
while FindResult do
begin
if ((DSR.Attributes and FILE_ATTRIBUTE_DIRECTORY) = FILE_ATTRIBUTE_DIRECTORY) and
not ((DSR.Name = '.') or (DSR.Name = '..')) then
{Recursion} RestoreBackup(APath + DSR.Name);
FindResult := FindNext(DSR);
end;
finally
FindClose(FSR);
FindClose(DSR);
end;
end;

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
if CurUninstallStep = usPostUninstall then
begin
RestoreBackup(ExpandConstant('{app}'))
end;
end;