Glad your software runs in Win 10 on the 531 in Win 7 compatibility mode.  But just because it runs on the 531 with Win 10, that's no excuse not to upgrade the Studio 540 to Win 10. Why not have both running Win 10 and give yourself some redundancy and security?  Besides, then you could run two projects at the same time...   Some firewire drivers can actually be installed into Win 10, and there are PCI-e cards that are compatible with Win 10 which support firewire devices. So google... Microsoft took all the Win 7 updates and patches down and won't be offering any new ones. So you can't download them, even manually, now.
Hi   Dell Studio 540, Intel Core 2Quad, CPU Q8200 @ 2,33GHz, RAM 4GB. 64bit.   The mark of my Dell isn't shown - so I posted here - please feel free to move my post to the relevant section.   Have an ancient if very reliable Dell Studio 540 with full antivirus but there are now security alerts. I have downloaded relevant MS downloads but they will not open - just go into an opening loop which does not resolve.   Have resisted Win 10 for this pc because it runs a brilliant, obsolete Win 7 compatible video editing software - best I have ever used.   Can the 540 upgrade to Windows 10 or do I need to lose it please - as a security risk?   Thanks
Studio 540 upgrade to Win10 - ?