Michal joined Xara in 2022 so that is why there have been no updates.

I too found it disturbing that all purchase links and account details just frittered away.
Clearly X-Builder is a confusing conflict with Xara's new Web Block so X-Builder has just been swept aside.

Ask Xara directly if it will provide you a copy of X-Builder on proof of your past purchase.
Also ask it about anyone providing a copy of any of free XBuilder-2018-legacy.zip (34.3MB), 20210334-XBuilder-free.zip (16.2MB) or the bought 2022-XBuilder.zip (766MB); the ZIP names were probably changed by me.

Acorn