What version have I installed I read that MB-Lab 1.7.5 requires Blender 2.80.74 or later. I cannot find what my exact version is, it just says 2.80.
Blender 2.9x
There are four locations that show the version in varying level of detail.
Splash screen


Status Bar

About Blender


Export System Information

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= Blender 2.91.0 Alpha System Information =
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Blender:
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version: 2.91.0 Alpha, branch: master, commit date: 2020-08-06 17:52, hash: 9a1ff4445b98, type: 
build date: 2020-08-06, 21:59:05


Blender 2.8x
There are three locations that show the version in varying level of detail.
Splash screen with the name of the release


Status bar with the version number


Help &gt; Save System Info detailed information including the commit hash

Excerpt from the system-info.txt
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= Blender 2.80 (sub 75) System Information =
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Blender:
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version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e, type: 
build date: 2019-07-29, 09:44 AM