You must install Zapstore to Download Mostro from there

https://zapstore.dev/apps/naddr1qvzqqqr7pvpzpklqkxldpq25w5qa4hlp7sx636su084zqg2p6skc446x7rav5w56qqfxuet5wahhy6ewd4hhxarjduhxzurssulxpx

Or just install Mostro from github:

https://github.com/MostroP2P/mobile/releases/tag/v1.0.1