I recently purchased the upgrade license from 4.023 to 4.167. 4.023 ran smoothly, no problems, but this new version is simply unplayable with my outdated graphics card. (extremely low frame rate). I've tried everything and no graphics alterations make any real difference. So I am wondering, can I uninstall 4.167 and reinstall 4.023? Will the new license or recent codemeter updates screw that up? I have purchased all the license upgrades since 2.5.