If you're interested in portable Linux AppImage format then checkout
https://github.com/ivan-hc/Calibre-appimage the unofficial AppImages are update-able via the developer's packaging manager AM:
https://github.com/ivan-hc/AM
The developer just included the preview/beta packaging as per my request :
https://github.com/ivan-hc/AM/issues/2050
ThankYou
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Unofficial Calibre installation via AM/AppMan
appman -i calibre
am -i calibre
for preview
appman -i calibre-preview
am -i calibre-preview
for betas
appman -i calibre-beta
am -i calibre-beta