cs5.5 version download

Which language do you have a license for?

CS5.5 downloads from Prodesigntools only support Western languages.

https://prodesigntools.com/adobe-cs5-5-direct-download-links.html

Did you not save your original download?

Any download will only work if you have your serial number

Go here for all older links https://prodesigntools.com/adobe-direct-download-links.html
Prodesigntools is an official Adobe partner, and the links go to Adobe, not a 3rd party site

IF/When you do have a download, be sure to copy it to AT LEAST one external device
you should ALWAYS keep a copy (or two!) on an external device
since Adobe DOES SOMETIMES REMOVE OLD VERSIONS FROM THE SERVER
a usb flash drive or external hard drive, or write to a CD or DVD
plus a text file containing your serial number if you have a serial number program

possibly depending on the exact version , but do you have a serial number?

Moved this to a better suited Download & Install forum

-Manan

Adobe InDesign CS5.5 has not been supported for many years. It is not available from Adobe for download.