I've installed the macOS Developer Beta Access Utility (.pkg file) from Apple Developer's official website. Upon completing installation, it opens the Mac App Store to the macOS High Sierra installation page automatically.
Under the 'Information' section, it's stated that the size of the installation file is 4.90 GB.
However, when I downloaded it, it didn't download the full installation file. Instead, it's only 7.8 MB large.
The installation file looks the same as a usual one.
So,
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Why are some users getting the 4.90 GB file while others are getting the 7.8 MB file?
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Is there any way to get the full 4.90 GB installation file?
Fyi, my Mac is currently running on macOS Sierra 10.12.3 (16D32).
Update
I appreciate the two answers that I've received and both can be reproduced. However, I'm not sure on why are some users getting the 4.90 GB file while others are getting the 7.8 MB file.
This thread from MacRumours suggests that it's something to do with the amount of disk space available on the Mac.
Best Answer
For what it's worth: I have encountered a similar issue: a very small download file (14,5 MB), that launched automatically after a few seconds... tried it twice (both times the installation failed giving me some error about corrupted information on the server - I'm not sure what it meant but it might have been related to the fact that I was logged onto the MAS with a different account than the one I signed up for the public beta with). Anyway I just retried again and just on a whim before clicking download I pressed alt on the keyboard... now it's downloading the full thing. This all happened in the space of 10 minutes.