If the app pool is switched to Network Service and restarted (as you say, I cannot see that on the screenshots you attached), this should work. It is very strange to have only one failed check, as the logs subfolder usually shows the same. Did you try to run the install regardless of the indicator? Installer needs the write privileges to modify the database connection string and the "installation done" flag in the web.config, and both changes can also be performed manually.
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