Looks like a cracked launcher, but it's most likely an issue with a mod you have.

Fixed, found a old post from a couple years ago (took me a couple hours to find) re installed the donor installer and it fixed it.
Thanks for the initial help ❤

@Dyiing I tested it now I joined into another player alt acc and see derp thank you so much bro! And you have best client guys by my opinion.

AFAIK, (for now) we can't get it here. Looked everywhere for it already 😅

Are you on MP or SP?

If you are on MP note the following statement from @Dyiing
"FastBreak has never been able to instantly break blocks, unless you are on Singleplayer. On Multiplayer it's simply too fast for the client-to-server connection."

@Dyiing я вспомнил что не правильные данные это карты "МИР" она только по России действует(но я попытался не получилось) а та карта с которой я пытаюсь оплатить пишет что "карта отклонена, воспользуйтесь другой картой"

ah fixed it , thanks bro

It still needs tweaking in 1.21.1

Check your firewall or any other antivirus softwares that could block downloads. You can also try manually downloading the file from the URL given in the error and then placing it in the path that it says on the error. Also make sure to close your launcher and open it again when making changes

You can follow the "Other launcher" instructions here: https://aristois.wiki/modpacks/
You will need to select the folder that the mods folder is located in (because Aristois will include the /mods/ dir). Usually it's the name of the modpack

Correct. You cannot have fabric installed in the instance

https://paste.ee/p/eXvjQ