I can't install 10.0.1 over 9.4.1 on my Mac (10.6.6) because I can't select the previous version during the installation process…I thought maybe I needed version 10 to update, but I went to Adobe's downloadable "older versions" and it just has 9.4.
Is there something else going on, or does anyone have an FTP URL with version 10.0.0 available for download?
You are probably trying to install update and not full installer. 10.0.1 updates can only be installed if Reader X is in your system. Here you have Reader 9.4. You can update this Reader to 9.4.2 and not 10.0.1
If you want to install Reader X on Mac, go to http://get.adobe.com/reader
This will download Reader X (10.0.1 full installer which includes the update) installer package on your system. Run this package to install Reader 10.0.1 on your system