i used google cloud platform to install LimeSurvey
want to upload LimeSurvey 3.0.0+171222 to 3.0.1+171228

step 4 File system error
Checking existing LimeSurvey files...
Warning: The following files/directories need to be updated but their permissions are set to read-only.
You must set according write permissions on these filese before you can proceed. If you are unsure what to do please contact your system administrator for advice.



how can I do?

thank!

an update changes the code of LimeSurvey. So yes, the updater needs write access to the files...

where can i change my write access?

ask to your hosting provider.