Oh, I have the same problem, could you guys help me? please, i’m desperate!! 
What version of SketchUp are you really using? There is no SketchUp for Schools 2021. SketchUp for Schools is a web version for school children. Are you using a cracked version of SketchUp 2021 Pro?
i’m using a cracked version of SketchUp 2021 Pro!!!
Then you’ve come to the wrong place for help. Software piracy is illegal.Purchase a subscription! Don’t be a thief!
Coming here as a software pirate is like stealing a car and then going back to the owner for help because it won’t start.
Since I had already opened the larger of your files successfully and started cleaning it up, I’ll show you this:
I fixed incorect tag usage.
And purged the unused components and materials from your model. I don’t know why you are hoarding so much stuff.
Sorry, I’m Brazilian, and I don’t speak English, I didn’t steal anything, I use the software I downloaded from the official sketchup website!!! I think there was a translation mistake
In SketchUp go to Help>Manage License and share a screenshot showing the license you are using. Until you do that I’m not going to continue fixing your files.
We have an IT company that installs all the softwares on our computers, as far as I know, we use them all with a license.strong text
I’ve fixed your second file, too. Same sort of issues as the first one I looked at. I’ll share the links to the repaired files after you provide he information I requested.
I’m checking if I’m able to share this information
Send the screenshot via a PM to me if you don’t want to show it publicly.
Boa noite Dave, poderia me ajudar a recuperar meu arquivo, estou desesperada
Por favor me ajude
You must give access to the file, make it public if you want to receive help.
Oiii, vou te encaminhar o acesso, se você conseguir me ajudar ficarei muito agradecida. Estou desesperada. [Juniorrr
https://1drv.ms/u/s!AqVXw4-jgy0toncBvrFfeWR_cV4E?e=xeMPUg
Olá, tudo bem? Vi que você conseguiu ajudar alguém com um problema semelhante ao meu, se for possível gostaria que me desse um auxílio, tenho um arquivo que foi salvo e em seguida o computador reiniciou automaticamente, após isso tentei reabri-lo e não abriu, apareceu uma mensagem dizendo “Esse modelo falhou na verificação de integridade e não pode ser aberto”, e isso acontece quando tento abrir o arquivo skb.
Translated by Google:
I certainly cannot help you unless you share the file.
Your profile shows you are using the “Free Plan” of SketchUp 2021. Does that mean you are using the cracked version?
Olha, não sei te dizer, tem uma empresa que faz a manutenção dos computadores e já vem tudo certo para utilizar. mas vou te enviar o arquivo para que você possa ver e tentar me ajudar se possível.
https://1drv.ms/u/s!AoO7tdWuaZH6lHvgFOmKLL8nzQOd?e=ZebnYo
https://1drv.ms/u/s!AoO7tdWuaZH6lHwH0IoZ16g_dDmX?e=xhYzEx
Translated by Google:
Sorry, I’m not going to help you.
Go to the help menu/manage licenses, there check if you have a classic or subscription license and take a screenshot of it, share it here to see if we can help you with the file.
Hello, my file stopped opening, I’ve tried all the alternatives I saw on YouTube
help!!!
Alguém consegue me ajudar com isso também?, o meu arquivo esta com o mesmo problema.
segue link do arquivo