gkarousis wrote:I have made a lot of work by using FreeCAD 0.17 with a build released on 15 to 30 November 2016 (I don't remember the exact build number).Few days ago I updated the version and now my work is loaded but the parts has been broken.
Hi! This may be too involved, but you can edit FCStd file to upgrade them to new format.
FCStd is a zip. Open it with your archiver program, and you'll see its contents. Extract everything into a folder. Open Document.xml. There, you will find objects and values of their properties.
You need to open a sample project of old format, a sample of new format, and then port your projects manually.
What exactly are your projects about? Most likely your project contained Parts and Bodies. Because that's the stuff that was changed seriously, and thus your projects went bust. But there may have been something else...
When you are done with porting xml, re-pack the project with "Project Utility", which is in FreeCAD, under Tools menu.
Eventually I may get into writing up a converter, because I have a fair number of broken projects myself, and I'd like to recover some of them (this one