I have Photofunstudio 6.1 HD Lite. If I download updates, will it be compatible with Windows 10?
You can download the updates form the page linked below, but it's unclear if they're compatible with Windows 10 or not. I have accessed the page and couldn't find anything related to Windows 10. Based on your version, download the available update and then apply it over your already installed version of PhotoFunStudio.
Download page: http://av.jpn.support.panasonic.com/support/global/cs/soft/download/index.html
If you encounter issues along the way, use the contact options and get in touch with tech support: http://www.panasonic.com/global/support/get_support.html
Note: Locate your country and then the support options will be displayed.