I had the same problem until I found out that the installer wants the complete path to the zip file, not to the extracted .img.
Downloads/SW_binaries_for_Xperia_AOSP_N_MR1_5.7_r1_v08_loire.zip
This could be clearer in the documentation.
B
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RE: Sony Xperia X (F5121) Error: Core: manual_download Error: checksum_mismatch