Although, I answered no, when it said it would restart my computer it restarted my computer. That sucks really hard. Never ever restart my computer unless I clicked yes I want to restart it NOW.
There also were tons of error messages during the install, no one can understand.
When you upgrade SeaDrive client, if the underlying library Dokany need to be updated, the installer will popup a message warning you that the system will be rebooted during the install. If you continue the installation, the system will be reboot without any further confirm. This is a limitation of Dokany library.
But I clicked no and my computer was restarted nevertheless. There was no way to prevent a restart. With other software it is possible to restart later.
Also the installation failed and had to be run again after the malicious forced restart.