Pasting text from Word into TinyMCE in IE11?

Question

TinyMCE

The site uses the tinyMCE editor version 3.5.10. The corporate browser of site users is ie. Recently, there was a transfer of users to ie older than version 10, after which problems began with adding text to the site (users copy text from MsWord and paste it either directly into the editor input field, or using the ”Insert from MsWord” plugin. In this case, the text is formatted incorrectly , the result is very different from the original formatting in
Word.At the same time, the same text added via ie8 is formatted correctly when pasted in any
way.Some of the problems were solved by additional tinyMCE settings, some were not.
Adding a header to the template did not solve the problem - when you click any button (i.e., call plugins), the editor continues to assume that it works in ie11, as a result, part of the functionality falls off in principle.
It is impossible to update tinyMCE to the latest version, because a large number of self-written plugins are used that will not work in the 4th version (checked).
The client cannot use another browser.
Is there a way to force ie11 to treat copied text the same way ie8 does, or some other workaround? The client can no longer return to IE8.