Last year I tried to do my own project on your engine. And now after reinstalling windows I cannot continue to work because my project was working on the assembly 2018 2.0x improved prefabs but i cant find this versionLast year I tried to do my own project on your engine. And now after reinstalling windows I cannot continue to work because my project was working on the assembly 2018 2.0x improved prefabs but i cant find this version
thanks for answer but i cant find this version in archive 
Click 2018.X
geez, man.
If you mean the old nested prefabs preview builds of Unity, well the feature was finished and bundled into 2018.3, so they took down the links to all the old preview builds. Just install 2018.3 or later.
Thanks guys ! 2019 normally works with my project without errors