I purchased the Adobe Illustrator CS4 (Windows,English) in 2009 but I'm still using it without any problems. Now I need to install it in a new computer and I don't have access to the download link in my account.
I also cannot deactivate the current installation on the old computer: I get the error message "We were unable to connectto Adobe".
I would very much appreciate your help on the above issues.
You just need to view them?
A lot of AI files have a PDF of the file embedded, so you can view them in Acrobat (the free version)
Other PDF viewer might work, but are not reliable to show the file in the way it was intended to be.
Since CS4 is quite an old version, a lot of files wouldn't open in it anyway and you were seeing the PDF part already.
You could try and contact support. You need a proof of purchase. And then ask for the download. Maybe they will provide it to you. https://helpx.adobe.com/contact.html