📝 update readme

Author: Troublor

INSTALL.md

@@ -28,7 +28,7 @@ yarn workspace @darcher/go-ethereum gen:dag
 
 The Ethereum DAG will be generated at the `ethash` folder under root directory.
 
-Alternatively, we provide a pre-generated ethash [here](https://zenodo.org/record/4812350). Download it and extract it at the `ethash` folder under root directory.
+Alternatively, we provide a pre-generated ethash [here](https://zenodo.org/record/4893187). Download it and extract it at the `ethash` folder under root directory.
 
 ## Prepare the Chrome Profile
 

README.md

@@ -56,7 +56,8 @@ See the FSE'21 submission #98 [preview version](./darcher-preview.pdf).
 
 ### Pre-configured Virtual Machine
 
-Alternatively, we provide a VirtualBox image [here on Zenodo](https://zenodo.org/record/4883114) (please always use the latest version on Zenodo), which contains pre-configured environment of *ĐArcher*.
+Alternatively, we provide a VirtualBox image [here on Zenodo](https://zenodo.org/record/4893187) (please always use the latest version on Zenodo), which contains pre-configured environment of *ĐArcher*.
+You can import it into your VirtualBox by following this [tutorial](https://docs.oracle.com/cd/E26217_01/E26796/html/qs-import-vm.html).
 Note that the size of the image is huge (approximate 23.2 GB) due to the fact that *ĐArcher* works on integrated testing of Apps, which requires a GUI environment.
 
 The default user of the virtual machine is `darcher` with password `darcher` (in case you need root privilege).