It's being used by Mac and Windows.But I can't download it.If you log in through the homepage, check the serial number registered in the product, and download it, you will see the characters shown as you go to the page below.[Don't see your app or plan?Some apps are no longer available to download. If you purchased your app from Adobe.com or registered it and don't see a download link, your app is not available. For example, you may not find the download link for some versions of Creative Suite including Creative Suite 4 and all earlier versions in yourEnterprise or volume license user? Learn about the support availability for your apps. ]https://helpx.adobe.com/download-install/kb/downloaded-older-app.htmlIs it impossible to download?Additionally, it cannot be downloaded via the link on the page.https://community.adobe.com/t5/lightroom-classic/download-link-to-lightroom-5-0/m-p/11951884