With the message "no blockchain available", you might need to add some working nodes.
You can find them here (click on Node List):
https://chainz.cryptoid.info/qrk/#!network
Here is the up to date blockchain:
http://www.nodepow.com/site/block?id=305 Regarding your wallet, you first need to make a backup of your mac wallet.dat file.
Then replace the windows .dat file with it. There are plenty of guides about how to do this and where to find the wallet.dat files on the mac and pc.
When the issues with the superblock are fixed, a new pc wallet will be released, followed by a new mac wallet.
Have you tried all the exchanges on the first page. As far as i'm aware Freiexchange are still accepting deposits, and perhaps the others too. I know that AEX is temporarily closed for deposits.
As i have stated, the issues with the code are being worked on.