Thanks for posting in Adobe forums.
I understand you are facing issue while installing Adobe Photoshop Elements 15 in your Mac & installer is asking you to download Adobe Support Advisor.
Can we follow the following steps:
- Click here to download Adobe Application Manager for Mac.
- After installation please double click its icon while searching it on finder to complete the installation.
- Sign in to Adobe Creative Cloud
- Start the installation process
Hope this works for you.