Wie kann ich Fehler 150:30 beheben

Try the Adobe Creative Cloud Cleaner tool and then reinstall Photoshop Elements 8.

https://helpx.adobe.com/de/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

I'll ping gener7  and see if he has thoughts on this.

Have you tried to run Photoshop Elements 8?

Okay so you opened Terminal and typed Sudo Python then pressed the spacebar once to put a space after Sudo Python

Next drag and drop LicenseRecover.py into the Terminal window, and then press <Enter>

Now you'll see the word Password, so go ahead and enter the the Password you use to log into your Mac and press <Enter>

Then you'll see a dialog that says Please choose a language

Press e for English then press <Enter>

press n and then the Enter key

the script will run if you press Enter

Give the script a few minutes to run and it should let you know when it is finished. When it is, Restart Photoshop Elements 8 and it should launch normally.

First go to Finder>Preferences>General and make sure External disks is checked.

Then when you double click the LicenseRecovery111.dmg it should show/open on your desktop.

How far have you gotten following the instructions here?

https://community.adobe.com/t5/photoshop-ecosystem-discussions/getting-error-150-30-opening-photoshop-cs4-on-macbook-pro/m-p/7003284#M44764

Many times a reinstall of an Adobe application  fixes the license issue.

See the correct answer here by gener7:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/license-for-this-product-has-stopped-working-error-150-30-running-cs4/m-p/10390646

Photoshop CS4 and Photoshop Elements 8 share the same code base.

What operating system are you using and version of Photoshop Elements?

From your screenshot it looks Photoshop Elements 8 on a Mac operating system?

This just happened out of the blue or you changed Macs and migrated pse 8 to the new Mac?

That error code is a liscensing issue.    A couple of ways it happens:   Manually turning off Adobe background processes that need to keep running when you are using the program, or your liscense information ghas become corrupt.

Go here, read it, scroll down to the bottom and download and run the liscensing repair tool you need.    

https://www.adobe.com/support/contact/licensing_download_eula.html

That screenshot is from an older version- and their are other things to try if my suggestion does not work.