3.4 (2022-05-24) #
Command Palette
customizable keyboard shortcuts
better support for epub files using mupdf’s epub engine. Adds text selection and search in ebook files. Better rendering fidelity. On the downside, might be slower.

The old legacy text engine (as used for epub etc) was removed in newer versions (3.4+) so you may prefer to add 3.3.3 or earlier as an option to newer ones by set an external viewer to SumatraPDF portable 3.3.3

ExternalViewers[
    [
   CommandLine = c:\path to\sumatrapdf.exe "%1%"
   Name = Older SumatraPDF
   Filter =
   ]
]

Ok so I installed the current 3.5.2 and also downloaded 3.3.3 portable. I opened the advance settings on 3.5.2 and entered this:

ExternalViewers [
[
CommandLine = C:\SumatraPDF-3.3.3-64\SumatraPDF-3.3.3-64.exe "%1%"
Name = Older SumatraPDF
Filter =
]
]

then opened an epub file.. everything is the same as my initial install of 3.5.2. How do I use an extrernal viewer?

Got it that worked!

It still has the problems that 3.3.3 had with deciding to skip the first 30ish chapters of a couple of my books but that is a seperate issue unrelated to this so thank you!

Now I will await the pre-release builds 3.6.x and hope they fix the white page on the sepia/parchment page

I should have mentioned in 3.6 you can add a shorter shortcut so for example mine is set to ALT + L

	[
		CommandLine = C:\Users\WDAGUtilityAccount\Desktop\Apps\PDF\SumatraPDF\SumatraPDF-3.3\SumatraPDF-3.3.3-32.exe "%1"
		Name = &Legacy SumatraPDF render
		Key = Alt + l 
	]

As for theeming the 2 inner colors will be #FBF0D9

FixedPageUI [
	TextColor = #000000
	BackgroundColor = #FBF0D9
	SelectionColor = #f5fc0c
	WindowMargin = 2 4 2 4
	PageSpacing = 4 4
	InvertColors = false
	HideScrollbars = false
        GradientColors = #FBF0D9
]

so those 2 give you

to add the outer theme

you can use

Themes [
    [
        Name = My eBook Theme
        TextColor = #000000
        BackgroundColor = #FBF0D9
        ControlBackgroundColor = #FBF0D9
        LinkColor = #8aa3b0
        ColorizeControls = true
    ]
]

result

Thank you for the theme! The one for the outer does not seem to work although the inner does.
But using an old version of it via 3.3.3 portable is the only way to get it to do the page turn that the new one no longer does?