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Just installed the brand-new 7.02 update for PK51. Lo and behold, my nice cleanly-compiling (under 7.01) project now has unresolved externals (with interesting new names) and code generation errors that didn't exist before. Be cautious about installing this update if you're in a crunch, and keep your older version handy in case you need to revert.
To obtain the key, you must either purchase the product, or steal it. You can request a quote for the purchase at http://www.keil.com/product/prices.htm, or see http://www.keil.com/product/sales.htm for distributors, upgrades, etc Hopefully, you are not a thief?