Android and Windows downloads are:

https://acadiapos.com/upload/npos.apk - new app(multi-platform, Android)

https://acadiapos.com/upload/npos.zip - new app(multi-platform, Windows)

For Bluestacks, you need to use a separate link for new app:

https://acadiapos.com/upload/npos_bluestacks.apk - new app(multi-platform, Android)

https://acadiapos.com/upload/base.apk - classical app(Android-only)

https://acadiapos.com/upload/rfsm.apk - classical app(Android-only, full service restaurants)

https://acadiapos.com/upload/inventorymanager.apk - app for inventory adjustment(multi-platform, available on IOS too, this is Android verison)
https://acadiapos.com/upload/warehouse.apk - more advanced inventory management(multi-platform, available on IOS too, this is Android verison)

https://acadiapos.com/upload/pad.apk - front facing / customer-facing screen app(includes features to manage customer account / rewards from customer side)

https://acadiapos.com/upload/menu.apk - interactive menu(for digital menu screens)

https://acadiapos.com/upload/kds.apk - kitchen display system(install to kitchen screens)

Most of those apps are available on PAX devices via PAX store.