Are you opening them in the same version of the engine that you created them in?
You could try to open the projects that ‘aren’t there anymore’ by going to the directory on Windows where those projects are saved and opening the .uproject file.
Are you opening them in the same version of the engine that you created them in?
You could try to open the projects that ‘aren’t there anymore’ by going to the directory on Windows where those projects are saved and opening the .uproject file.