My stick came with Windows 10 (32-bit). I'm considering installing the 64-bit version.  Has anyone done that on the Stick, how was it done (I presume by using a bootable USB stick), was it successful, and were there any problems?

I have (at least for the time being), given up on this idea, because Win 10 (x64) occupies about 27GB out of 51GB usable (64GB total) on the internal drive of my Surface 3.

A 64bit Windows with 32gig storage and 2gig ram is very bad juju. 32bit is definately the way to go on such devices.

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I have (at least for the time being), given up on this idea, because Win 10 (x64) occupies about 27GB out of 51GB usable (64GB total) on the internal drive of my Surface 3.

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There is another reason this may not be a great idea:  Lenovo x64 drivers.  Now, I don't know if there are other Lenovo x64 computers that use the same chips as the Stick 300, or whether the x64 chip drivers are available from other resources (eg, Intel), but I offer the following observation:

Background:  Last week, I decided to run the built-in Windows 10 recovery.  I had done so a month ago, and it installed & worked without any issues.  This time, however, it hung 29% of the way into the recovery reinstall.  Repeated rebooting just produced a message to reinstall, with no apparent way to do that.

No problem, I thought;  I have a bootable (generic) Windows 10 install USB stick, and I successfully ran an x86 install to completion (and it was quick!).  WiFi worked, and I was able to successfully download and update drivers for all the yellow-flagged devices shown in Device Manager.  However, the display adapter (shown as "Microsoft Generic" or some such) had no yellow flag, and attempts to update the video driver simply resulted in "you already have the correct driver".  Now, the HDMI 1920x1080 display worked fine, so what was the problem?

No audio (eg, from the HDTV through the HDMI port), and the only choices in the audio menu were pre-installed "speaker" drivers.  Installing the Lenovo "System Interface Foundation" (SIFv1.0.51.2.exe) did not help.  Before tracking this problem down further, I decided at this point to upgrade the BIOS, and a separate thread here describes the result of that attempt.

I'm pretty sure an x64 install won't be any better with respect to available x64 drivers.

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I have (at least for the time being), given up on this idea, because Win 10 (x64) occupies about 27GB out of 51GB usable (64GB total) on the internal drive of my Surface 3.

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There is another reason this may not be a great idea:  Lenovo x64 drivers.  ...  I'm pretty sure an x64 install won't be any better with respect to available x64 drivers.

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It's a moot point.  I just got my replacement Stick 300, and once I made sure the version on the Stick was activated, I attempted to boot a Windows 32/64-bit install USB stick, and selected the 64-bit install.

I promptly received an error message that the processor is not a 64-bit processor, despite Windows 10 x86 on the Stick saying it is.  This is similar to another Windows 10 x64 install I attempted on an old Dell machine.  It had Windows 7 x64 installed, but apparently recent 64-bit processors have a couple of new 64-bit instructions, that Windows 10 x64 needs.

However, this is a little surprising for a new product.  Oh, well;  it's not a big deal.