The more simple way to update from 1.1.7 to 1.1.8 is give below--
2-make new fresh installation of the new release - say 1.1.8
3-in this new installation, copy from the original one, and in the same folders :
* personal designs (from app and from skin)
4-rename the old installation folder as _backup or anything, and rename the new installation folder as the old one (important because
configuration holds the base URL).
5-open any page in the magento shop : this will automatically update the database to the new format of 1.1.8.
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