Issues I encountered when building Windows Store apps on a new laptop

I took over my beloved wives samsung ativ book 9 recently as her first job granted her a brandnew surface pro 3 cost half covered by her own salary and possessed by her company (hope she will stay with the company a bit longer).

I found the ssd amazing and way faster than my old laptop's spinal drive. So I started moving out all the rubbish including the backup partitions unncessary to me and continued programming my windows apps on it straight away.

One thing I found that hindered me was I couldn't launch and debug a paid software made by me and purchased by my wife on this new laptop. And the issue was exactly as described by the discussion below

https://social.msdn.microsoft.com/Forums/windowsapps/en-US/7ef57428-bd52-4b8a-aa04-d5b6afbd6700/error-dep0700-registration-of-the-app-failed-another-user-has-already-installed-an-unpackaged?forum=toolsforwinapps

I did what was suggested there and got it amazingly work. However after that I found all my microsoft/live account associated apps stopped working (exit on loading). And I suspect it was to do with what i did above and a few common housekeeping options for windows store didn't work (like wsreset.exe). the only way I found to resolve that was to uninstall them first and retrieve them again from the store. once reinstalled it still reported error when launching. But this time it provided me a link to the store where it shows that the app needs repair and I can repair it. after that all seems back to perfect.