The file "Save As" box is on the browser side, so unfortunately we can't definitively tell you why it's not appearing for you without accessing your computer; however, here are a few reasons why it might not be showing from previous experience:

1) It may be open already. Hold down the "ALT" key then press "TAB" to cycle through open windows. Check for one titled "Save File As...". On a Mac, hold the Apple Command key + the tilde (~) key when in Safari.

2) Your browser might be blocking it. Check for a yellow bar on the top of your screen saying "This download has been blocked" or similar with an options or allow button. If you're using an anti-virus program, ad-blocker, or browser plugin make sure to add catsone.com to your trusted sites.

3) Some browsers like Safari (and Firefox as an option), by default, will not prompt you for where to save files. In Firefox, click the "Tools" menu, then "Options". Select the "Main" tab, then check off "Always ask me where to save files". You should now be prompted each time you download a file as to where you want to save it.