Please see the links below to upgrade your wallet from DNotes v2.0.0 to DNotes v2.0.1.
Update details: Reduce the number of CRISP transactions per block and completely remove the transaction input limits.
This release will be incompatible with the 2.0.0 Release after 04/30/2018 8pm EDT. If you are still running the old wallet by then and staking you may create an orphan fork.
If you have the previous version of the wallet, you can simply replace it with the new version from the download links above.