Lightroom "Edit In" problem.

Hi There.

When I try to use "Edit In" it only shows Photoshop 2020 ( apart from Color FX etc), but PS 2020 won't open, it just keeps coming up with error messages. I have asked on the Photoshop forum about these.

How can I get LR to use PS 2019 v20.0.7, which does open and work ok?

Thanks.