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        How to install 64bit binaries for TeX Live on Windows


In the following, $INSTALLDIR is $SELFAUTOPARENT in the TeX Live,
that is, the parent directory of "texmf-dist".

(1) Expand the file tl-win64.zip in $INSTALLDIR,

(2) After expanding tl-win64.zip in $INSTALLDIR,
    change related command PATH from
    $INSTALLDIR\bin\win32
    to
    $INSTALLDIR\bin\win64;$INSTALLDIR\bin\win32

    Note that the following 32bit binaries in $INSTALLDIR\bin\win32
    are still used on WOW64:

    cjpeg.exe       djpeg.exe       gunzip.exe      gzip.exe
    jbig2.exe       latexindent.exe png22pnm.exe    sam2p.exe
    tif22pnm.exe    tlaunch.exe     unzip.exe       xindy-lisp.exe
    xindy.mem       zip.exe
    
    Moreover, tlmgr.bat does not exist in $INSTALLDIR\bin\win64
    due to an obvious reason.

    Thus $INSTALLDIR\bin\win32 is necessary "after"
    $INSTALLDIR\bin\win64.

    If there are problems in 64bit binaries, it is easy to recover
    the original TeX Live win32, by changing back the PATH:
    $INSTALLDIR\bin\win64;$INSTALLDIR\bin\win32 --->
    $INSTALLDIR\bin\win32

(3) Ghostscript is assumed to be 64bit. The dvisvgm.exe searches
    for gsdll64.dll by reading registry, and gsftopk.exe searches
    for gsdll64.dll in the command PATH. Therefore users should
    install 64bit Ghostscript and set the command PATH for the
    Ghostscript. However, don't define TEXLIVE_WINDOWS_EXTERNAL_GS
    in texmf.cnf, because the preinstalled 32bit Ghostscript is
    also used in several cases.

    The 64bit binaries are made with the latest sources. Therefore
    several TeX engines may not be compatible with the present
    TeX Live. Thus users should run the command
    fmtutil-sys --all

-- 
Akira Kakuto