Download & Install instructions https://forums.adobe.com/thread/2003339 may help
-includes a way to go to a page to download Adobe programs if you don't have a disc or drive
-you will need to enter your original serial number during install for non-Cloud programs
-or kglad links in reply #1 here https://forums.adobe.com/thread/2222942 may help
Lost information - see reply #1 in https://forums.adobe.com/thread/2008767
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You should be able to simply reinstall the program and then reactivate it.
If you are not able to activate the product using your serial number for some reason, contact Customer Care via chat and explain the situation.
Thanks John. I got it back.