Update Center write permission check prevents users from updating

Nb 8.2 app installed by User. When User gets new updates via a private Update Center the Platform app returns with "Write Permission Problem", "You don't have permissions to install plugin xyz into the installation directory" - starting the app with "Run as administrator" does the trick. Some other installs work just fine.

From http://bits.netbeans.org/8.0/javadoc/org-netbeans-modules-autoupdate-services/overview-summary.html and http://bits.netbeans.org/8.0/javadoc/org-netbeans-modules-autoupdate-services/apichanges.html#check-write-permission I see some write permissions were added to the API since my earlier 6.5 based version which did not have this check. 

Though I do understand the need to check for write permission, I am just confused why this is happening when it is the SAME user who installed the initial application locally and runs it locally and who is getting the updates locally to install - why the error - all the same user on same machine ?
 

Does any have some suggestions/best practices how to avoid this ?