"Connection to the server has been lost" error during restoring backup

[phonesystem]

Hello everybody. Please help me to solve this problem. My 3CX version is 16.0.619. I need to upgrade our 3CX to v18 and I backup from my current 3cx (v16) and I unintalled 3CXPhoneSystem16 and I installed 3CXPhoneSystem18 and I tried to restore my 3CX backup file from V16 in 3CXPhoneSystem18 web browser and I got this error "Connection to the server has been lost". What is the problem. In chat they told me to update to 16.0.8.16 but I can't find that update. Another thing my backup file size is 2.5 GB. One of the reasons might be this?

 

[ChrisC_3CX]

You actually should've been able to do this. I would recommend trying the CLI installer.

Uninstall 3CX, re-install, and when you get the following windows select option 2:


You'll need to specify the backup file's location at some point.

Let me know if this works.