I need photoshop cs5.1 install file.

NOTE - Adobe has removed ALL public download links for installs and updates
-links are ONLY available to someone who purchased a download from Adobe
-CS6 (and earlier) are no longer sold or supported by Adobe, and no authorized
--vendor has copies to sell... not by disc, and not by download of an installer
.
The Adobe employee who advises volunteer helpers (I am one) said this on 12-18-2019
"Adobe employees will no longer be engaging with Creative Suite customers to provide support via chat, phone, or social media"
That means that you will not be given a download link by contacting customer support
.
For CS6 back to CS4 you may download ONLY if you bought direct from Adobe via download
-Log-in to your account and click this link https://account.adobe.com/products
--click Order history on the left and then the link to your order that will show on the right
--and finally click the link "Downloads and serial numbers" that will appear
---as always, write the serial number in a text file AND copy that text file and the
---download file(s) to an external drive (or two) to be sure you have what you need
-if you did not buy direct from Adobe via download you must find your original install
-if you have an Education or volume license you MUST use your original media
--the link for an Education or volume license download is not available at all
-if you bought a disc and don't have a drive you will need to buy an external USB drive
-if you bought and lost a disc Adobe does not provide a replacement via download
-if you bought a download from a 3rd party vendor you will need to contact that vendor