You provided no link to the exchange. I would taken some time to go through the site to see if it's really worth using. Searched for VDS or VDS exchange via Google, didn't get a straightforward answer. So, a direct link to the exchange or its other sites would help.
I found this download link in their Telegram group:
Android Download:
https://ipfs.io/ipfs/QmQjKU7H7C57zB2QyrT3gWuweivyUc9v9EXFiWFzcfGsdEchange the file name to .apk to install.
Let me know if you need link to Windows and Linux version