Bright morning energy here — yes, you can often get 'gentle' as a downloadable file to read offline, but the exact method depends on who published it and how they distribute it.
If 'gentle' is commercially published, the usual paths are buying from an ebook store (Amazon, Kobo, Google Play, Apple
books) or checking the publisher's website. Many stores let you download
the book to your device for offline reading inside their apps. That download may not be a plain PDF; Amazon tends to use its own format, Kobo and many indie stores use
epub, and some vendors offer PDF directly. Libraries are great too: Libby/OverDrive and Hoopla let you borrow ebooks and download them for offline use within their apps. If 'gentle' is older and in the public domain, you might find a free PDF on sites like Project Gutenberg or the Internet Archive.
A couple of cautions from my experience: DRM can lock files so you can only
read them in the vendor's app or approved software, and removing DRM can be legally risky. If you prefer
pdfs for fixed-layout reading or printing, check if the seller offers a PDF version. Otherwise ePub or vendor formats usually read fine on
e-readers or phones. I love having a downloadable copy for trips — it’s peaceful to unplug and still dive into 'gentle' on a plane or train.