In case you didn't write down your 25-word mnemonic, here's how to get it back and restore the wallet under the new version:

* Open the blur-wallet-cli.exe of an older version
* Sign in to your wallet
* Type encrypted_seed and hit enter
* Enter your password again and hit enter
* Hit enter twice (unless you have an optional seed encryption passphrase)
* Copy the 25 words
* Go to the folder where you saved the files of the newest version
* Type powershell in the address bar of that folder and hit enter
* Type .\blur-wallet-cli.exe --restore-deterministic and hit enter
* Create a wallet file and paste the 25 word mnemonic when prompted (it asks you to paste it line by line)
* You should have the new wallet files in the folder

Exactly the same happened to me. Was some bad timing, as I sent Blur right before the website went down for maintenance. I even received the e-mail notification for the deposit but when the site came back up my balance was still zero. I have an open ticket with support and they've asked for the txid. We'll see how it goes. I guess it's a good way to test whether the exchange is legit now that the $ values are still small.

Edit: Support resolved the issue. You should probably contact them too.