Project on Unity made in 5.1 but unity is in 5.2

When I try to downgrade the project unity crashes, any way to downgrade?

Thanks!

https://www.google.co.uk/search?q=unity+downgrade+project&ie=utf-8&oe=utf-8&client=ubuntu&channel=fs&gfe_rd=cr&ei=BARfVuDyD4Pj8weujomYBA&gws_rd=ssl

I think you may need to reimport everything to a fresh 5.1 project (with Unity 5.1) without any meta files. You will get lost links and associations.