Hi all! Those who are wondering how to set wallpaper in Wallpaper Alive come here!

First, let's open the program itself. Then press the key combination "Ctrl + Alt + C"
After that, we open the panel.
In the upper right corner of the panel, we see the DONATE and WALLPAPERS buttons.
We need to click on WALLPAPERS, after which, we will be transferred to the Steam Workshop.
There we select the wallpaper we like, after which we hover over them with the mouse and click on the Plus sign (+) at the bottom.
We are looking for the Workshop section in the application and click on it. A subsection called Browse opens. There will be all our wallpapers that we have chosen.
Under the wallpaper, press the "Select" button and from the bottom right, press "Update Desktop"
Ready! Wallpaper on your desktop

Now I'll tell you how to install your wallpaper (Not from the workshop).
To begin with, in the program we find the Config section. Below, under the inscription Desktop Background, there will be a button "Select a file" Click on it and look for the file. if the Program crashes after you click on the "Select File" button. In this case, we do the following.
Wallpapers in the mp4 file are dragged onto the "Choose file" button. After that, the wallpaper is installed in the program.
OK it's all over Now. Also do not forget to check the box next to the text "Autostart Wallpaper Alive on Boot" (this is necessary in order for the program to start with Steam)

I really hope it helped you. I also wish health to your loved ones, regardless of what nationality you are and what country you are from! Good luck!

If you decide to thank me for this guide, you can give out a reward. I will be pleased)