Hi,
With HikaShop 2.2.2 we improved the mails with a new templating system and a new design.
HikaShop offer you to override every elements : views, css, mail.
When updating HikaShop, if you have some overrides, they will be kept and still use.
The HikaShop configuration (which is stored in the database) is not altered or modified with updates.
If you modified directly a HikaShop core file (without using the override system), you will loose your modification during the update because every HikaShop core files are updated.
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.