I have not been working a lot with Trados 2017 for the last 3 years and if I did, it was rather on a simple level, only with files and my own TMs or with packages from clients with integrated TMs and glossaries. Actually I am having a new client where I need to work with Trados again and on a deeper level which requires more knowledge and handling of tools like connecting to worldserver, generating glossaries in the Glossary Converter etc. Again and again I am finding myself with technical issues (cannot connect to worldserver, glossary converter does not work or any other error messages) and it takes me ages to find the reason or I do not find it. Maybe some of the issues also have to do with the fact, that I work on Mac in the virtual machine Paralells and Windows 10 installed on it. Therefore I thought to buy a support package from SDL for one year to make sure, that I get immediate help when I face these problems. But I cannot get a support package for Trados 2017, only for 2019 version. My question to those who made the step from Trados 2017 to 2019:

1. Do these versions differ a lot? Was is easy or a challenge to get into the new version? 

2. SDL Chat support told me that I can have both versions installed. Are there any inconveniences with having 2 versions installed on my Mac? Could that create another issue?

Thanks and looking forward to hearing from you.