InstallState not existent in windows 2008 R2, installed should work

[pvonow]

Please check the following items before submitting a PR -- thank you!

Note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms. Contributor Code of Conduct.

• [ ] There is no existing PR that addresses this problem
• [ ] Mentioned any existing issues in your commit so they get linked and closed once this PR gets merged, i.e: Closes #1554 in the body of a commit
• [ ] Followed the instructions in the Contributing document
• [ ] Ran the unit/spec tests and ensured they still pass
• [ ] Added tests to cover the new behaviour
• [ ] Updated the documentation to match the changes
• [ ] When possible, add an entry to the CHANGELOG file
• [ ] Squashed your PR down to a single commit. You may forego this if the PR tries to address multiple issues. Though we prefer one PR per feature/fix, sometimes that's not feasible. In that case ensure that a single feature/fix and associated tests and documentation is bundled up in one commit

Optional, but extra points:

• [ ] Added tests to ensure the old behaviour cannot accidentally be reintroduced

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[matthewrstone]

Hi @pvonow. I have PR #58 open that switched over to Installed vs. InstallState and restores Win2008R2 support.