The player that you have screenshotted will be classified as abusing bugs and glitches. Please report him at https://pika-network.net/report.
In the meantime, you can report this bug at https://pika-network.net/bug-report/.
Sorry, but there is not a direct method to download the official PikaNetwork maps. Some of the maps that were added to Pika has its own thread and then approved by the developers, so maybe you can search them up and they provided direct download links.
I really want to become a developer but school has been catching up to me... I need to finish all my personal projects then I can (hopefully) make a portfolio that will impress the owner - or maybe madmax idk