How to install CS5 from Mac to Windows

you can download and install a windows version, but you can't activate it, because the mac and win programs would have different serial numbers (as mentioned by @barbara_a7746676).  with the win version, you would be installing a 30 day trial version.

here are links to the cs5 trial versions, https://prodesigntools.com/all-adobe-cs5-direct-download-links.html

follow the directions (esp, step 1)

save the install file. it won't remain online.

thank jim @ prodesigntools.com

There is no way of doing that any more, I'm afraid.

Back in the Creative Suite days, purchases were platform specific: Windows only or Mac only. Adobe did offer crossgrades from Windows to Mac and vice versa but that stopped many years ago. Even then, crossgrades still involved a paid-for upgrade e.g. CS5 Windows to CS6 Mac.

Have you considered subscribing to a Cloud plan and running modern software on your Windows device? One advantage of Cloud apps is that the operating system no longer matters; you can run them on Mac or Windows.

Cross-platform installations were not available with version CS5