Hi,
The date and the hour for the filename is dynamic and correspond to the moment when you have performed the download.
When the "automatic update" is not activate, we might update the package if we found a blocking issue.
Once the "automatic update" is activated, we try to not touch the packages.
For HikaMarket and HikaSerial, I update the package very few. But if you want to check if the package has changed, you need to check the build number or the "creationDate" in the XML file.
About HikaSerial, there was no update since the release. No major issue has been reported.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.