ZOHO plug in for outlook disappeared

I have had the ZOHO plug in for quite some time installed and working in outlook (2013, 32 bit). One morning, it went missing. I contacted ZOHO support and they were able to help within minutes. The following day, the plug in disappeared again. I traced the steps that the ZOHO support completed and that did not correct the issue again. Please advise. I've tried uninstalling and reinstalling with no luck.