Hi Gypo-01
Thank you for posting in Microsoft Community.
Congratulations on your new Surface Pro 9! Based on the description you posted, it seems that you have an issue with Surface Pro9 wherein you can install and use software that is compatible with Windows 11. However, software that is designed for other operating systems, such as iOS on the iPad, will not work on the Surface Pro 9.
To transfer software from your wife's old laptop to the Surface Pro 9, you will need to reinstall the software on the Surface Pro 9 using the installation files or installation media. If the software was purchased through a digital store, such as the Microsoft Store or Apple App Store, you may be able to download and install it on the Surface Pro 9 using the same account that was used to purchase it.
Regarding upgrading the SSD, it is recommended that you seek assistance from a professional technician to ensure that the upgrade is done correctly. SSD removal in compatible Surface devices - Surface | Microsoft Learn and Download Surface Service Guides from Official Microsoft Download Center
I hope I have answered all your questions. Thank you for your understanding. Please let me know how it goes.
Kind regards,
Christopher.