You need to install .Net 3.5 SP1 on Windows 8 before you can install any version of SQL Server. You need the special install media for Windows 8 found in the \SXS folder, and use the command below to do the install. Apart from that SQL Server 2008 does install OK.
Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:"full path to \sxs" /LimitAccess
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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