The first issue is called At Home (at home)
Read from the description of the theme: Enjoy the peaceful moments at home with these 15 premium, 4k images, available for free on the topics of Windows 10. Download it here:
The second issue is Amazon Landscapes (Amazon landscapes)
Put on your desktop the waterways and forests of the most diverse area in the world with these 20 premium 4K images, free for themes Windows 10.
The third issue Amazon Wildlife (Wildlife of the Amazon)
The Amazon rainforest has more animal species than anywhere else in the world. Take a look at 18 of these images premium 4k images, free for themes Windows 10.
There is also a new regular theme (not 4K) for Windows 10. Reclaimed by Nature (Recovery from Nature)
Scary or wonderful? These 16 images of vehicles and architectural buildings recovered from nature are free for Themes of Windows 10.
If you have a lot of themes installed and you no longer need them, you can delete them.