Firstly, save the charts you want to export to Solar Fire in one of your Astro Gold folders in the iCloud Drive (see Using iCloud for more info).
If you are doing this from a Windows computer, you can copy any file from the Astro Gold folder that says it is a ".SFcht" file from there and get it into Solar Fire on your Windows computer.
>> How to transfer files to Solar Fire on a Windows computer
On your Windows computer, using the "File Explorer" application:
1.Open the "Documents" folder
2.Open the "Solar Fire User Files" folder
3.Open the "Charts" folder
4.In the browser window where you have logged into your internet "iCloud Drive", and have also opened the Astro Gold folder in it, copy any .SFcht file from that folder and then paste it into the Charts folder in File Explorer (or you can just drag the files from one to the other if you know how to do that).
5.When you have copied all that you want, you can exit both folders.
6.If Solar Fire was open, close it. Then re-open Solar Fire and you should see all of those charts from the iCloud available to you.
>> How to transfer files from Solar Fire on a Windows computer to the iCloud Drive
1.On your MacOS computer in the Safari app, log into your internet "iCloud Drive" (see Using iCloud for more info), and also open the Astro Gold folder in it.
2.On your Windows computer, using the "File Explorer" application
a.Open the "Documents" folder
b.Open the "Solar Fire User Files" folder
c.Open the "Charts" folder
d.Copy any .SFcht files you want to transfer to Astro Gold
3.In your iCloud Drive in the browser, paste these copied files into the "Astro Gold" folder - which you already have open.