https://bugs.winehq.org/show_bug.cgi?id=46455
--- Comment #8 from Martin Sandsmark sandsmark@samfundet.no --- Oh, I didn't read the stacktrace properly, didn't see the «Unhandled exception: unimplemented function UxTheme.dll.SetWindowThemeAttribute called in 32-bit code (0x7bc513e9).»
FWIW, you can probably dig out the installer URL from the js code of my.remarkable.com, the only reason it's not displayed without a device connected to the account is because it is useless without it (so to avoid confusing customers).
But to spare you the wasted time of digging through minified JS: https://storage.googleapis.com/remarkable-client-software-540221a9321a8a52ec...