to be able to take pictures of the game client now you need to make a hotkey for this. This meditation is being taken by combating cheating programs in the game. For this reason, a multitude of applications and programs are unable to capture the game screen causing it to remain completely black. Without scrolling to make the hotkey just hold the CTRL on your keyboard and press the K key and this shortcut will open the CUSTOM HOTKEYS, now click on GENERAL HOTKEYS will appear the shortcuts to the action bars, battle list ... well, scroll down mouse cursor until you reach the MISC option and find TAKE A SCREENSHOT in that option you will program a hotkey so that the game's client takes screenshots of your character without the black lock screen appearing. I usually use the "print screen" key as a shortcut because it helps me remember the hotekey if it helps you choose one for yourself.
Regarding a totally free program to make game videos without the black screen lock, I recommend using OBS Studio (
https://obsproject.com). I use version 25.0.0 but currently has a newer version. There are several videos on youtube regarding the settings needed to start recording. It is an exceptional program in addition to recording videos together with audio (if you wish) it also gives you the opportunity to live on streaming platforms. In addition to all this, its interface is easy to understand and self-teaching, being very good for laypersons.