You can design a form to run on a specific target version of Acrobat and Adobe Reader. Designer ES displays warning messages when you try to use a feature that the selected target version does not support.
When you specify a target version of Acrobat and Adobe Reader, you must ensure that you have the correct version of Acrobat installed that matches the target version saved; otherwise, you may get an error or warning message when you click the Preview PDF tab. For example, if you select Acrobat and Adobe Reader 6.0.2 or later as the target version for the form, ensure that you have either Acrobat or Adobe Reader 6.0.2 installed. Similarly, if you select Acrobat and Adobe Reader 7.0.5 or later, ensure that you have Acrobat and Adobe Reader 7.0.5 installed.
The preview will use the same format as the saved form. You can right-click the Preview PDF tab to see which format is currently selected. To indicate the format of an unsaved form, you must change the Tools > Options > Document Handling > Default File Type For New setting.
See also 

To select the Acrobat and Adobe Reader target version