# Stacks compatibility **URL:** \ **Category:** RapidWeaver Classic\ **Created:** [March 17, 2021, 5:40pm UTC](https://forums.realmacsoftware.com/t/stacks-compatibility/38236 "2021-03-17T17:40:05Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jeffreyg](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@jeffreyg](https://forums.realmacsoftware.com/u/jeffreyg)\ **Post date:** [March 17, 2021, 5:40pm UTC](https://forums.realmacsoftware.com/t/stacks-compatibility/38236/1 "2021-03-17T17:40:05Z")
After losing my previous version of RapidWeaver along with some themes and Nick Coates Stacks to a lightning strike I am ready to purchase the latest version of RapidWeaver along with Foundry. Will the version of Stacks that can be downloaded from the free version available to previous owners of Stacks be compatible and work with that combination? ---
**Author:** ![teefers](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/teefers/32/8173_2.png) [@teefers](https://forums.realmacsoftware.com/u/teefers)\ **Post date:** [March 17, 2021, 7:51pm UTC](https://forums.realmacsoftware.com/t/stacks-compatibility/38236/2 "2021-03-17T19:51:36Z")
Foundry requires stacks 3.5.6 or newer. The latest version of stacks is 4.2.2. Not knowing what version you had before (2, 3, or 4) it’s hard to say if it will work. You should go ahead a download and get the serial number and then you can upgrade (less money) to version 4 if you want. ---
**Author:** ![system](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/system/32/25301_2.png) [@system](https://forums.realmacsoftware.com/u/system)\ **Post date:** [April 17, 2021, 5:51am UTC](https://forums.realmacsoftware.com/t/stacks-compatibility/38236/3 "2021-04-17T05:51:39Z")
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