Files don't import or export at all when multiple versions of memoQ are installed

Context: You have at least two versions of memoQ installed. You have noticed that since you installed the upgrade, you cannot import or export files because of an error message.

Description: In quite a few cases, we have noticed that multiple memoQ installations may cause memoQ to malfunction. This is an installer error, files of different version get confused. You get an exception that says MESSAGE: Builtin config missing for PPTX filter, or Builtin config missing for XLSX filter, or Builtin config missing for DOCX filter like below.

------------------ Inner exception ------------------

TYPE:
System.Exception

MESSAGE:
Builtin config missing for PPTX filter

SOURCE:
MemoQ.DocConverters.PPTX

CALL STACK:
  at MemoQ.DocConverters.PPTX.PPTXConverterConfiguration..ctor()
  at MemoQ.DocConverters.MSPowerPoint.MSPowerPointConverterConfiguration..ctor()
  at MemoQ.DocConverters.MSPowerPoint.MSPowerPointConverter.GetDefaultConfigurati
on(String primaryFileName, String[] additionalFileNames)
  at MemoQ.DocConverterConfiguration.ImportConfigRepository..ctor(IList`1
restrictionList)
  at MemoQ.DocConverterConfiguration.ImportOptionsDataGridView..ctor()
  at MemoQ.Project.TranslationDocImportExport.ImportOptionsDataGridViewWithLangua
geSupport..ctor()
  at MemoQ.Project.TranslationDocImportExport.DocImportOptionsForm..ctor()
  at MemoQ.Project.TranslationDocImportExport.ProjectImportControllerBase.Prepare
(Form ownerForm)
  at MemoQ.Project.ProjectDocument.ImportDocument(Form owner)
  at MemoQ.Project.TranslationProjectSettingsControl.handleImportDocument()

If this happens, just uninstall both versions of memoQ, delete everything under C:\Program Files (x86)\Kilgray or C:\Program Files\Kilgray, and reinstall the applications. This way you delete the conflicting files manually, and resolve the issue.