Symptoms
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Unable to remove WordPress instances via Domains > example.com > Applications > Remove: Permission Denied 
 Page just reloads with no errors 
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In some cases, the process finishes with the message below, but the WordPress instance is still shown: {"status":"success"} 
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The following error can be observed with debug enabled in %plesk_dir%adminlogsphp_error.log:2019-06-19 21:45:55] ERR [extension/wp-toolkit] An error occurred when dispatching action 'removeAction': Permission denied 
 [2019-06-19 21:45:55] DEBUG [extension/wp-toolkit] pm_Exception: Permission denied
 file: C:Program Files (x86)ParallelsPleskadminplibmoduleswp-toolkitlibraryControllerAction.php
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Attempts to remove the instance return {"status":"success"}on a blank page in a browser
Cause
This issue is reported as bug ID EXTWPTOOLK-3043 which will be fixed in future updates.
Resolution
Until the issue is resolved, the following workaround can be applied:
When the instance is shown in WP Toolkit
- Log into Plesk.
- Remove instance via WP Toolkit
When the instance is not shown in WP Toolkit
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Connect to the server via SSH 
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Run the following command to find the ID of the instance: # plesk ext wp-toolkit --list |grep example.com |awk {'print $1"t"$7'} 
 365 http://example.com/old
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Remove the instance with the following command. Use the ID from step 2. as value after -instance-id:# plesk ext wp-toolkit --detach -instance-id 365 
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Remove the WordPress related files of the removed instance in the file system