the size Chart module is compatible with bagisto V1.4.3 we will update it on our git repository as soon as possible.
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RE: Sale Sticker Not Coming under Configurable Product
We will fix this in our next release
RE: Is exist a book or some documet about working with the Bagisto as end-user?
Are you looking for a doc on using Bagisto and the Admin user panel? Because if you are, then I want to inform you there is not one user guide. There are user guides on all topics. So if you want to understand on any particular feature, you can google that keyword along with the bagisto keyword.
By the way, all the user guides are in this section, you can explore them further: https://bagisto.com/en/docs/