Something must have gone wrong with the file ‘LibreOffice_6.2.7_Linux_x86_deb_sdk.tar.gz’ as it was uploaded, because the tar command cannot make sense of it:
$ tar -tf LibreOffice_6.2.7_Linux_x86_deb_sdk.tar.gz LibreOffice_18.104.22.168_Linux_x86_deb_sdk/ LibreOffice_22.214.171.124_Linux_x86_deb_sdk/DEBS/ LibreOffice_126.96.36.199_Linux_x86_deb_sdk/DEBS/libobasis6.2-sdk_188.8.131.52-1_i386.deb gzip: stdin: unexpected end of file tar: Unexpected EOF in archive tar: Error is not recoverable: exiting now
Also, the signature on the file is bad:
$ gpg --verify LibreOffice_6.2.7_Linux_x86_deb_sdk.tar.gz.asc gpg: assuming signed data in 'LibreOffice_6.2.7_Linux_x86_deb_sdk.tar.gz' gpg: Signature made Fri 30 Aug 2019 18:15:25 CEST gpg: using RSA key C2839ECAD9408FBE9531C3E9F434A1EFAFEEAEA3 gpg: BAD signature from "LibreOffice Build Team (CODE SIGNING KEY) <firstname.lastname@example.org>" [unknown]
All other files that I verified (x86 as well as x86-64) are OK.