I intentionally did not renew my BS3 subscription as I found BrewFather has the updated features like Tilt integration that BS had promised almost a year ago and still had not incorporated into BS3. I transferred all my recipes back to BS2 as back up and I am still in the process of transferring them into BrewFather. I've been lazy......
I tried loading BS3 after reading your post and found I receive the "Your License Has Expired" message. When I log into BS, I see the subscription has been deactivated.
Did you ever back up your recipes electronically? If you did and used the BeerXML (*.XML) extension, you will be able to import the file into any program. If you used BS's (*.BSM or *.BSMX) extensions, you may have to use a BS program as I am not aware of any program that has a conversion feature.
Good luck!