I have PAF 5.5.07.Had failure in upgrading to 5.1.12.Used 77034999, 9.72 MB, English.Went well in downloading file.Coundn't install it. Got the message "cannot determine publisher due to -authenicode signature not found" .I clicked OK and then got the message "the install shild engine ?ikend.exe could not be installed. The system con't read from the specified device.
I tried to upgrade 3 times over a few weeks with the same results. I should ask if the upgrade is worth while? Thanks.