Unable to find "Adobe PDF" resource files "Acrobat PDFMaker"

 I can't utilise the option "save as adobe pdf" without this message coming up. 
Have tried all suggested advice on other threads including

https://community.adobe.com/t5/acrobat-discussions/quot-unable-to-find-adobe-pdf-resource-files-quot-feb-2021/m-p/11844015 and https://helpx.adobe.com/acrobat/kb/pdfmaker-error-unable-to-find-adobe-pdf-resource-files.html.
Need this to work as this is a very important tool. 

thanks