Wondering if theres a need to download additional drivers. Working with OXS Yosemite 10.10.5 and have downloaded LIGHTWORKS from web but can't open it. Thanks

Hello,

There are known issues with the very first release of V14.5 on Yosemite. They are assumed to be fixed with most recent release. You'll find it under Downloads on top of this page. Please download, try installing and see what happens.

If that doesn't help, any plans to upgrade to High Sierra or Mojave?

I run High Sierra, can't say much about Mojave, but I'm pretty sure that Lightworks V14.5 will run on both.

Personally, I wouldn't upgrade my OS just to test unknown software.

Doesn't work the updated version on Yosemite? What error do you see?