Screenflow 6.2.4 exporting - no video!

I don't use screenflow much, so I don't really want to pay the upgrade. But when I do use it, I really need it. Screenflow 8 automatically downloaded, so I manually reverted to an older version  and now it's not working. It exports sound, but video is black with little bits of dark blue colour but no images. Please help. This has taken hours of my time already. I have an edited file that won't export and I don't really want to have to do the 4 hours editing all over again. I found what I thought would have been the answer on another thread that said 6.2.4 was fixed. but it's not. Apparently an NVIDIA problem (no idea what that is....). Can anyone help a normal niaive user, not a techie to get this software to work properly?

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  • I'd like to help but there's not enough information for me to troubleshoot.
    6.2.4 should work on High Sierra but it is not compatible with Mojave.

    Please read READ BEFORE POSTING at the top of this product forum and include all the details and I'll be glad to help.

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