I downloaded a blueprint and I got this errorlog

It looks like this crash mostly occurs if the blueprint either contains vegetation, or if vegetation in blueprints is enabled in the config.properties file Vegetation in blueprints isn't supported unfortunately. Basically the game is supposed to ignore that, but apparently this setting can still trigger this crash. Please go to your game directory, open the "config.properties" file with a text editor, and have a look at game_blueprint_include_vegetation. Make sure this is set to false (otherwise change it to false and save the file).

If you still run into this crash, it's possible the blueprint in question was created while the blueprint creator did set game_blueprint_include_vegetation to true. Maybe you can post the blueprint here (or send it via PM to me)