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Only developers have access to the DP7 install (full version) file. If you downloaded DP 7 and it is 1 GB or less in size, you don't have the full version. The smaller size file is meant to be installed as an update to DP 1-6.
 
Only developers have access to the DP7 install (full version) file. If you downloaded DP 7 and it is 1 GB or less in size, you don't have the full version. The smaller size file is meant to be installed as an update to DP 1-6.

I'm planning on doing PB2 anyways, but could I, in theory, install the first dev preview and do the updates?
 
I'm planning on doing PB2 anyways, but could I, in theory, install the first dev preview and do the updates?

You can. There is a known glitch with DP1, in regards to updating properly to the subsequent releases. I didn't have a problem when I first installed DP on a new partition. The updates would show in MAS. However, when I started over recently(fresh - wiped drive) with a single partition, I couldn't get passed DP1, as it kept saying part of the update could not be installed. I tried numerous times using the same DP 1 that had worked to begin with. After messing with it all day yesterday, I made a USB install for PB and everything went fine.
 
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