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What issue do you have with downloading from the PTC site?
We will not be able to download exe files from the site hence we would need physicals CD/DVD to upgrade Implementer, same was did in the past as well.
Regards
Sunil Mathew
Try to find a PTC's reseller in your local region: https://www.ptc.com/en/partners/find-your-partner
I also note that, the quote: "The CD being shipped is dependent on active maintenance agreement with PTC".