with macOS Sequoia , app downloads and installations from the Mac App Store will no longer require twice as much available storage space.

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Instead, the free space requirement will correspond to the final installation size of the app, plus a small safety, as stated by Apple.
The new space requirement in macOS 15 will greatly benefit users who download large games. Currently, in macOS Sonoma, users must ensure twice as much available space, which is often a problem for games that can take up tens or even hundreds of gigabytes.
In macOS 15 beta 2, you only need to have enough space for the final size of the game and a little extra, according to the information. macOS 15 will notify users if they have enough space to install an app from the Mac App Store, making it easier to manage storage space.
Apple has asked developers to update messaging about app size requirements so that they are aware of the new change. This will reduce confusion about the free space required for new app installations.
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macOS Sequoia is currently in its second beta , with a public beta expected in July and a general release in the fall.
Source: macrumors
