Installing CS4 from CD?

An idea that MAY work to install and/or run old programs in Windows 10... works for some, not for others

-RIGHT click the program icon or EXE and select a compatibility mode in the pop up option window

-or Run as Administrator http://forums.adobe.com/thread/969395 to assign FULL Windows permissions may help... says Encore, but sometimes required for ALL Adobe programs (this is NOT the same as using an Administrator account)

-or more on permissions https://forums.adobe.com/thread/2293598

NOTE - Win10 anniversary update version 1607 has caused MAJOR problems with old programs, so the above may not work

-Notice http://www.computerworld.com/article/3157369/windows-pcs/new-windows-10-build-is-a-monster-update.html

Owners of old programs simply have problems with Windows 10... none of which is Adobe's fault... Adobe did not change your old program to make it stop working... Microsoft changed their operating system and THAT is why your old program won't work, not because of anything Adobe did... Also... every time Microsoft issues a Win10 update, there is the risk that an old program that HAS been working after the initial Win10 upgrade will STOP working... bottom line, old programs require a matching old operating system

Since CS4 is so old, you may need to manually run the setup program on the disc... if it will work at all on Win10