1) Do NOT uninstall ACA2019 or do much of anything with it until ACA2022 is fully operational to your liking.
2) Are you changing computers? Are you moving the Projects locations? If not, unless you opted from some unusual filing method, just open one of your projects in ACA2022 and follow the prompts to repath files etc. if asked.
3) Did you ever take the time to separate your customizations from the core product (separate CUIx menu file, separate folder for Materials you curated etc.)? For those users that need/want migration to always work, it is the better approach. If not, you can use the CUI command's TRANSFER tab from inside ACA2022 to move content from ACA2019's CUIx file, you just have to know where that is by looking for it in OPTIONS command's FILES Tab, under the CUSTOMIZATION FILES>Main Customization File's entry. For Materials etc. OPTIONS command's FILES tab lists where most other folders are saved at.
HTH
