I have try to install this great PDF printer by administrator account.
After that, the local user can not be see the correspond directory in "SAVE as" windows. I discover the PDF24 loaded the "C:\document and setting\administrator" instead of the current user.
I also try to use "pdf-creator.exe" and "pdf-creator.msi" with "Setup Parameter/Arguments".
Now, the problem solved by reboot / kill the pdf24.exe manually and run by current logon user.
Summarize:
After the installation, the "pdf24.exe" will be run automatically with install user privilege. That cause the current non-administrator user can not see the correspond directory.