the theme has been tested to work with version 5.6 and above (as stated on the marketplace page).
I'd suggest you to update to the latest versions. It's always a good idea to keep concrete5 updated.
However, if you really need the theme to work with version 5.5.2, I think this should be possible. You'd only need to edit /packages/theme_long_story_short_parallax/controller.php and change line 6:
protected $appVersionRequired='5.5.2';
This should allow you to install the theme.
Hope that helps!
Jordi
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the theme has been tested to work with version 5.6 and above (as stated on the marketplace page).
I'd suggest you to update to the latest versions. It's always a good idea to keep concrete5 updated.
However, if you really need the theme to work with version 5.5.2, I think this should be possible. You'd only need to edit /packages/theme_long_story_short_parallax/controller.php and change line 6:
This should allow you to install the theme.
Hope that helps!
Jordi