Any issue downloading it from here? https://github.com/zapstore/zapstore/releases
In fact, I would first install Obtainium and then install zap.store through there by copy/pasting the GitHub releases link above into Obtainium, as then you will be alerted about any updates to zap.store. You can get Obtainium here: https://github.com/ImranR98/Obtainium/releases
this is my next challenge!