Ive flashed a card as normal with no problems, save one package (Mathematica) will not as yet install.

You should be able to run it on a RasPi that supports 64 bit.

Raspberry Pi 4 Buster 32 Bit Kernel By

This is because a Raspberry Pi loads a 32 bit kernel by default.

You have to tell it to use the 64 bit kernel bootkernel8.img.

This can be done with an entry in bootconfig.txt.

Just mount the fat (boot) partition of the fresh flashed SD Card, attached to your flashing machine, and add this line to it.

As you can read there, it has some limitations and it is not official propagated.

Any code built against these libraries will require changing to refer to a more standard location (usrlib rather than optvclib) 3.

Due to 2) Many packages that expect libGLESv2.so libEGL etc will require rebuilding.

Making statements based on opinion; back them up with references or personal experience.

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Raspberry Pi 4 Buster Download