At least a couple other people with the download version of DD could load games saved in the CD/DVD version, but could not save the game after that. Even if the save rar wasn't corrupt it may not be any help.
However, there should be a patch for the downloadable versions soon. Lar posted a week ago in an RPGWatch forum that (among other things) "DivDiv remaster - the digital distribution versions have been updated to handle the issues that were reported."
Someone mentioned in another topic emailing GOG to complain and getting a replacement div.exe and configtool.exe emailed back, which fixed their problem (couldn't open certain chests).
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