I bought SH3 via download from the Ubisoft site.
The d/led files are saved to an external drive, and I've reinstalled the game several times on my PC from there. Also burned the downloaded files to a DVD and that setup.exe file works just fine as well.
Of course things may be completely different with SH5, but I always make backup copies of program setup files when I buy something via download and I've never had a problem reinstalling from the backups if necessary.
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