Remove your previous chaindata from your Denarius data directory. Download the latest chaindata.zip to save time and unzip it to your data directory. Reopen Denarius and you should sync up no problem.

Latest chaindata.zip: https://gitlab.com/denarius/chaindata/raw/master/chaindata.zip

Also we are currently working on v2.5.2, which is almost finished, we will have a lot more fixes in this coming release as well, staking balances were fixed in this coming release as well to be a bit less confusing!

Remember to get on at least v2.5 before block 900k! Once block 900k, all old nodes will no longer connect to our network.