Hi there!
We're happy that you're enjoying the game!
The paid versions of the game, such as the Big Fish version, don't have the option for in-app purchases. However, the in-game economy is adjusted for this and provides you with the Lavastone Generator.
That said, if you wish to play the free-to-play version of the game on a desktop computer (with optional in-app purchases, including animals like the Lemur, Heron and Flying Squirrels), you can download it through Steam or Windows Store:
https://store.steampowered.com/app/949050/Virtual_Villagers_Origins_2/https://www.microsoft.com/en-ca/p/virtual-villagers-origins-2/9pdm6gwqb6zmYou can also play it in Facebook (or on Facebook Gameroom):
https://apps.facebook.com/villagersoriginsThese are versions that we in Customer Support can provide assistance with as well; the paid versions that are sold by a third party (iWin, Wild Tangent, etc.) and not supported by us.
Rain functions in the same manner in all versions of the game.
Let us know if you have any other questions and thanks for playing!