Check the "Compiler Archive" section on Microchip’s official website. They maintain old versions for customers with active maintenance agreements or legacy needs.
picc --version
Microchip has officially discontinued standalone HI-TECH installers, but they occasionally remain on their FTP archives. Search for HI-TECH C Compiler for PIC10-12-16 on via the “Software and Tools” legacy section. You will likely find v9.82 or v9.86. Version 9.83 is sometimes included as an update patch. Hi-tech C Compiler For Pic10 12 16 Mcus V9.83 Download
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Optimizes code across the entire project for smaller footprints. In the dimly lit basement of an old
Are you trying to from an old project to a newer chip?