I can't export my edited video on a free version

Lightworks is offering me only 1080 or higher size to export (exportation failed error

Welcome to the forum.

This is an occasional error that turns up. I would try uninstalling Lightworks, then downloading it again and reinstalling. Your project will be safe because it's stored in separate folders in the User directory, rather than the Program directory.

You can make a backup before doing this. It's the project menu in the top left corner of Lightworks under the details tab.

Thanks
Your advice helped

BUT

now I have to apply some effects once again

I would have assumed that the effects would be still in the project file. What type of effects are these?

some of my videos are reversed (in previous version I changed degrees )
now some of video pieces are running reversed (as original video was shot)

but don't worry

I can fix this

P.S.that's strange but the applied saturation effect didn't changed in one piece after reinstallation

No effects should have changed, unless you had used custom effects. Reinstalling any of those should bring your sequence back to where you left it.

Dr.Sal wrote:

Lightworks 2020.1 automatically corrects the rotation angle. If you have done this manually with effects in a previous version, it is now rotated twice, which leads to an undesirable result.

You have two options:

- Now remove your unnecessary effects, or
- Deactivate the automatic rotation in the project settings: