It may be a bit more complicated for old installs looking to upgrade using the 6.95b package.
Several of the files need a bit of customization so just blindly replacing them without that customization will likely impact your site.
For ajax-dashboard6.php, any settings NOT overridden by things in Settings.php $SITE[], you should check old v.s. new and copy your old settings there to the new script.
Same applies to the AltAjaxDashboardConfig.php file (some new settings were added for the sunpie).
get-aqi-rss.php - get/parse AQI value (USA ONLY)
note: customize get-aqi-rss.php for your location
raintodate.php - parse dailynoaaclimatereports for data
note: may require additional customization for your location
cloud-base.php - WD-configured Bashewa cloud base display script
note: may require additional customization for your location
So a bit of compare/update in new is recommended.
For the ajax-images/ directory, it may have some icons you need, so it's safe to upload the directory as-is to your site.
Same with the ./cache/heavenpie.png image -- it will be replaced with up-to-date image when the new ajax-dashboard6.php runs on your site.
Do let us know if you found something else that needed doing for an update and I'll add it to the docs.