Windows 10 Technical Preview Direct Link

Microsoft jumps straight to Windows 10, brings back the Start Menu

  

This is by design, because Microsoft wants to incorporate testers’ feedback early on in the development process so it can avoid a Windows 8-like flop. So this isn't an OS you want to install on your primary PC.

How bad can it get? “Unexpected PC crashes could damage or even delete your files, so you should back up everything. Some printers and other hardware might not work, and some software might not install or work correctly, including antivirus or security programs. You might also have trouble connecting to home or corporate networks,” reads a Microsoft FAQ.

Even those installing Windows 10 Tech Preview on a Windows 8.1 PC might need to update or reinstall applications and peripherals.

Make sure any PC you use to test the Windows 10 Technical Preview meets the minimum criteria. System requirements include a 1GHz or faster processor, 1GB of RAM for the 32-bit version and 2GB of RAM for the 64-bit version, and 16GB of free hard disk space.

Now try Windows 10

Windows 10 Technical Preview Official Links:

English 64-bit (x64)
Download (3.81 GB)  
SHA-1 hash value: EB75A3D3C0F621F175B75DC65DB036D0E00EAC43

English 32-bit (x86)
Download (2.93 GB)

SHA-1 hash value: 73AC23AD89489855F33CA224F196327740057E2E

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English (United Kingdom) 64-bit (x64)
Download (3.79 GB)  
SHA-1 hash value: 17C6CD7224D13DB61B93A4A9D38202E3A0019378

English (United Kingdom) 32-bit (x86)
Download (2.94 GB)
SHA-1 hash value: BFF496678A09255738BFBFA14903295D55478C33

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Chinese (Simplified) 64-bit (x64)
Download (3.96 GB)   
SHA-1 hash value: 135E3193571C5AF9FBF36D24D07B2BE7EE49B2E8  

Chinese (Simplified) 32-bit (x86)
Download (3.05 GB)   
SHA-1 hash value: 3EE3A2033BE666BA55AFED3FCF6BB52A7C15C7CC  

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Portuguese (Brazil) 64-bit (x64)
Download (3.76 GB)
SHA-1 hash value: 3DA91BB9EA7316F670C0A132D940FC1D58BAB296  

Portuguese (Brazil) 32-bit (x86)
Download (2.91 GB)   
SHA-1 hash value: 611FE8F94906EFE75F64D197913344AC040DF644  

Product key: NKJFK-GPHP7-G8C3J-P6JXR-HQRJR

Windows 10 Technical Preview for Enterprise Edition Official Links:
English 64-bit (x64)
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_EN-US.ISO

English 32-bit (x86)
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X86FRE_EN-US.ISO
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Windows 10 Technical Preview(Enterprise Edition) ZH-CN
x64

http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_ZH-CN.ISO

x32

http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X86FRE_ZH-CN.ISO
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Portuguese – Brazil

x32
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X86FRE_PT-BR.ISO

x64
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_PT-BR.ISO
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English – Great Britain
x32
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X86FRE_EN-GB.ISO

x64
http://care.dlservice.microsoft.com/dl/download/F/5/7/F574727C-B145-4A7D-B85B-11C4E8DC894B/9841.0.140912-1613.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_EN-GB.ISO
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Windows 10 Technical Preview for Enterprise doesn’t require any product key but for recovery cases, you can use following product key:

PBHCJ-Q2NYD-2PX34-T2TD6-233PK