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Build option (for 8051 project) greyed out in uVision 5.27.1.0

Jim Seymour

I'm trying to bring up a C51 project from a couple of years ago in uVision.  All looks OK initially, but the Build option is greyed out.

It's as if it lost its brains about using the C51 compiler.

Can anyone offer insights as to how to diagnose this issue?

I bought a "Perpetual" license for PK51 back in 2019 and it shows in the License Manager that support expired at the end of 2020.  But I know I used it successfully early last year.

I tried installing the latest version of uVision, but the system won't let me download it since I'm outside the support period.

Any help would be appreciated.

Thanks.