To Make Acrobat portable for older reader, you should change the option in Acrobat Distiller with the following steps.
- Open the Acrobat Distiller. Click Settings > Job Options.
- In the Job Options windows, switch to the General tab. Then choose the version that you need from the Compatibility's drop-down menu. (i.e. Acrobat 4.0 (PDF 1.3))
- After all, save the changes by pressing OK or Save As for the Acrobat to take effect on the next process.