Ok, first issue solved: Extraction of the update theme created an additional folder in themes “evolve-plus_2.0.1”. Caused one part of the issues.
Now, I have extracted the update theme into the evolve-plus folder. Works partly. However, the fonts and probably some more settings are not imported to the new theme: Fonts do not match, revolution slider appears where it should not, title moved vertically…
Prior to theme-update: 2RadReise_prior_to_update
After the update: 2RadReise_post_update