Error "connection to bitcoin client lost!"

[CodeAndCoins]

I have recently install armory and after I run it, I got this error message "connection to bitcoin client lost! Armory can not send nor receive bitcoins until connection is re-established"
May this is a reason I did not receive any bitcoin which I send to this wallet.
Also, at the bottom, it says "Node offline" (0 blocks).

[droark]

Is Bitcoin Core running? You need to run that too.

[CodeAndCoins]

Is Bitcoin Core running? You need to run that too.

How to know that

[HCP]

Is Bitcoin Core running? You need to run that too.

How to know that

Did you download, install and run Bitcoin Core? It is a completely separate application from Armory. You would (should!) know if you downloaded and installed it!

If you haven't already, you can download Bitcoin Core from here: https://bitcoincore.org/

For Armory to work properly, you will need Bitcoin Core installed, running and FULLY synced. NOTE: this will mean that you will need to wait for it to fully sync the ~250 gigs of blockchain data.

[CodeAndCoins]

Is Bitcoin Core running? You need to run that too.

How to know that

Did you download, install and run Bitcoin Core? It is a completely separate application from Armory. You would (should!) know if you downloaded and installed it!

If you haven't already, you can download Bitcoin Core from here: https://bitcoincore.org/

For Armory to work properly, you will need Bitcoin Core installed, running and FULLY synced. NOTE: this will mean that you will need to wait for it to fully sync the ~250 gigs of blockchain data.

Thank you very much, now I am downloading. And its size is very huge  . May it take about 2-3 days to complete the download.
Is it possible to bitcoin core from a selected date range like from 2018 and up to? It is downloading from a starting point of transaction.

[HCP]

Is it possible to bitcoin core from a selected date range like from 2018 and up to? It is downloading from a starting point of transaction.

No. That would completely break the "trustless" nature of Bitcoin and the blockchain.

The entire concept of the blockchain is that it is an unbreakable chain that can (and should) be verified from the very first block to the very last. If you skip the beginning, you have no way of verifying if the data you are currently getting is correct.

If you are not able to run Bitcoin Core due to time/space constraints, you might be better off exporting your private keys out of Armory and using them in a "light" wallet like Electrum.