提问标题：MacBook Air 2015 升级 Monterey 后，无下载记录如何下旧版 iWork？求官方方案/MacBook Air 2015 (macOS Monterey)：How to Download Old iWork Without App Store Purchase History?

Hi everyone, I need help with installing the old version of iWork suite on my MacBook Air. Here are the details:

My device is a 2015 MacBook Air, which has been upgraded to macOS Monterey (the latest supported system version for this model). Now I need to use Pages, Numbers, and Keynote, but I’m stuck with the download issue. The core problem is:

• My Apple ID has never downloaded any iWork apps from the App Store (no purchase or acquisition history).
• The latest iWork version in the App Store requires macOS 14 or later, so searching for it directly shows a "system incompatibility" prompt.

I’ve checked some resources:

• Some users mentioned downloading compatible old versions via "Purchased" in the App Store, but there’s no related record in my account.
• I also read that 2015 Macs might have come with pre-installed iWork, but my device was bought second-hand—the original pre-installed suite was uninstalled long ago, and there’s no corresponding ID record.
• Additionally, iWork '09 clearly doesn’t support Catalina or later systems, so I’m worried that old trial versions won’t be compatible after download.

I’d like to ask everyone:

1. Without download records, is there an Apple-official channel to get the old iWork version compatible with macOS Monterey (e.g., v12.x series)?
2. If I need to contact Apple Support, what key information should I prepare in advance (e.g., device serial number, system version)?
3. Are there other compliant and secure solutions (no third-party cracked versions) to solve this problem?

大家好，想请教一个关于旧版 iWork 套件安装的问题，具体情况如下：

我的设备是2015 款 MacBook Air，目前已升级到macOS Monterey（该机型支持的最新系统版本），但现在需要使用 Pages、Numbers 和 Keynote，却遇到了无法下载的困境。核心问题在于：

• 我的 Apple ID从未在 App Store 下载过任何 iWork 应用（无购买或获取记录）；
• 目前商店里的 iWork 最新版本要求 macOS 14 及以上系统，直接搜索下载会提示 “系统不兼容”。

我查阅了一些资料：

• 有用户提到通过 App Store 的 “已购项目” 下载兼容旧版，但我的账户里完全没有相关记录；
• 也看到有说法称 2015 款 Mac 可能预装过 iWork，但我的设备是二手购入，原预装套件早已被卸载，且无对应 ID 记录；
• 另外，iWork '09 明确不支持 Catalina 及以上系统，担心下载旧试用版后无法适配当前系统。

想请教大家：

1. 无下载记录的情况下，是否有苹果官方认可的渠道能获取适配 macOS Monterey 的 iWork 旧版（比如 v12.x 系列）？
2. 若需联系苹果支持，有哪些关键信息需要提前准备（如设备序列号、系统版本等）？
3. 有没有其他合规且安全的方案（非第三方破解）可以解决这个问题？