Error on instaling plumsail 1.8.7

Good day , i want to test new version 1.8.7 on SharePoint 2019 test environment , but have an error on instaling .spkg package..

by instaling .exe such error

Hello @ixxxl,

You need to complete the installation of the server-side solution before uploading the app package.

Remove the app package, disable the Plumsail Forms feature and then install the farm solution. Try installing using the WSP package. Find the instructions here.

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Thank you!