I'm a graphic designer

[ElenaPrikrylova]

Now I use AutoCAD 2018 on my working machine in office. Some days ago, I was finishing huge project in AutoCAD, and everything was almost done. But today I've opened my project and saw - Drawing file is not valid. I repeated the process of opening, but it didn't assist. Now I'm in huge trouble, in couple of days I have to send it to customer.

[Manfred M]

Now I use AutoCAD 2018 on my working machine in office. Some days ago, I was finishing huge project in AutoCAD, and everything was almost done. But today I've opened my project and saw - Drawing file is not valid. I repeated the process of opening, but it didn't assist. Now I'm in huge trouble, in couple of days I have to send it to customer.

Welcome to CiC Elena.

This is primarily a photography site and with the possible exception of a few engineers or other technical members, you won't find a lot of AutoCAD knowledge here. I haven't used that software in many years.

I would suggest a call to AutoDesk's technical support group for help on this issue, if there is no knowledgeable help at your office.

[TonyW]

Is it a silly question to ask if you have looked for recent backups that might be useful?

[MilagrosLain]

Now I use AutoCAD 2018 on my working machine in office. Some days ago, I was finishing huge project in AutoCAD, and everything was almost done. But today I've opened my project and saw - Drawing file is not valid. I repeated the process of opening, but it didn't assist. Now I'm in huge trouble, in couple of days I have to send it to customer.

Sometimes can be situations when you can’t download dwg repair software by normal or usual methods. You may refer to following instruments like:

https://knowledge.autodesk.com/suppo...orruption.html
http://www.cad-addict.com/2009/07/au...o-recover.html
https://www.repairtoolbox.com/autocadrepair.html