Firstly, you'll need to download the latest version and extract it over the old one.
There is a link to the Mame homepage in the menu at the top of the page.
Just follow the Mame Installation page and when it asks you to overwrite any files, answer Yes.
This shouldn't cause any problems with the general running of Mame however, updated systems may not work because some of your roms will be wrong. The most common problem when Mame has an update is caused when incorrect or damaged roms are replaced with good ones.
Further reading: can be used with ROM management tools such as ROMLister and Simple Arcade Multifilter in order to sort and filter a MAME collection by genre or by other tags, such as whether it includes "Mature" content.
Once you begin working with software tools to help validate, rebuild, or filter your ROM collection, you will quickly encounter the need for "DAT" files, so named because they usually (but not always! DATs describe the ROM contents including filenames, file sizes, and checksums to verify contents are not incorrect or corrupt.Every project on Git Hub comes with a version-controlled wiki to give your documentation the high level of care it deserves.It’s easy to create well-maintained, Markdown or rich text documentation alongside your code.If you use the command line then you'll get the message above.To fix this error you just need to re-download the whole system rom zipfile.