Epson AcuLaser C8500 Setup Manual page 62

If the Digital Signature Not Found screen appears, click Yes. If you
click No, you must reinstall the printer software as described below.
1. Make sure that the printer is off and that Windows is running
on your computer.
2. Insert the CD-ROM that comes with your printer into your
CD-ROM drive (this is usually the D: drive).
3. The EPSON Installation Program screen opens automatically.
If the EPSON Installation Program screen does not appear
automatically, click Start and choose Run. Then enter
D:EPSETUP.EXE and click OK (substitute the appropriate
drive letter, if necessary).
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Installing the Printer Software