Thank you for your post.
Your FileMaker Pro 6 Trial is only good for 30 days. After 30 days, the trial is over and you are prompted to purchase the product.
One option is to install FileMaker Pro 6 Trial on another machine, and you will have another 30 days to transfer files. If another file isn't available to you, then you can send in your file, and I'll move it over to FileMaker Pro 13 for you. Check your Inbox at the top of this page for instructions where to send the file.