Problem installing Google Analytics and other add-ons

Hello, dear Plonists,

'Google Analytics' fails to install under 'Site setups -> Modules' and returns an error message. Here is its text traceback (I receive the same type of error message when trying to install other add-ons, such as the 'webcouturier.dropdowmenu' add-on):

Traceback (innermost last):
Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 48, in call_object
Module Products.CMFPlone.controlpanel.browser.quickinstaller, line 689, in call
Module Products.CMFPlone.controlpanel.browser.quickinstaller, line 454, in install_product
Module Products.GenericSetup.tool, line 388, in runAllImportStepsFromProfile

  • traceback_info: profile-collective.googleanalytics:default
    Module Products.GenericSetup.tool, line 1433, in _runImportStepsFromContext
    Module Products.GenericSetup.tool, line 1245, in _doRunImportStep
  • traceback_info: jsregistry
    Module Products.CMFPlone.resources.exportimport.jsregistry, line 15, in importJSRegistry
    Module Products.CMFPlone.resources.exportimport.resourceregistry, line 36, in importResRegistry
    Module Products.GenericSetup.utils, line 512, in _importBody
    Module Products.CMFPlone.resources.exportimport.resourceregistry, line 163, in _importNode
    Module Products.CMFPlone.resources.browser.cook, line 163, in cookWhenChangingSettings
    Module Products.CMFPlone.resources.browser.combine, line 169, in combine_bundles
    Module Products.CMFPlone.resources.browser.combine, line 115, in write_js
    Module, line 162, in writeFile
    Module OFS.Image, line 139, in init
    Module OFS.Image, line 544, in _read_data
    Module transaction._manager, line 147, in savepoint
    Module transaction._transaction, line 228, in savepoint
    Module transaction._transaction, line 344, in _saveAndRaiseCommitishError
    Module transaction._transaction, line 225, in savepoint
    Module transaction._transaction, line 713, in init
    Module ZODB.Connection, line 1000, in savepoint
    Module ZODB.Connection, line 547, in _commit
    Module ZODB.Connection, line 579, in _store_objects
    Module ZODB.serialize, line 419, in serialize
    Module ZODB.serialize, line 428, in _dump
    PicklingError: Can't pickle <class 'plone.formwidget.recaptcha.interfaces.IReCaptchaLayer'>: import of module plone.formwidget.recaptcha.interfaces failed

I am running Plone5 on a Virtual Private Server (VPS) with Ubuntu 18.04. I also would like to install the 'Open Web Analyser' (instead of Google Analytics). Any hint or advice in either or both of these issues would be very much appreciated.

This plugin seems to be whats causing the problems. uninstall that or find a newer version that works