Hey guys,
I´m working for ISP and I got little problem. We got 2 Dude systems. One is working properly everytime, but sometimes when I try to connect to the second one the program only pops out for a second and then immediately closes. By any chance do you know what could we wrong? I tried reinstalling, running as an administrator. Thanks for your advices!
Using version 6.45.9, we can’t upgrade to newer version due to some things I don’t know 
If I understand the situation correctly, the 6th branch of the OS is 32-bit, memory addressing up to ~2gb, the system simply does not address higher, no matter how much you install. Memory in the 6th branch runs out (leaks) and Dude starts to crash. In your case, you need to try moving to the 7th branch, there the memory is already addressed normally 64 bit, add RAM to the server if necessary. Watch when crashes begin for the amount of remaining RAM, when ~200 MB remains - we are guaranteed to have glitches. And you need to write a script that reboots the server once a day and makes backups. You can also try to make a DB vacuum - but this does not actually help.
It is unlikely that you will be able to simply transfer the database - you will have to transfer everything from the 6th branch to the 7th version manually.
And here’s another point, if you’re going to transfer - you need to raise another server on it with a lvl 4 license, transfer it so that the old server works. Otherwise, if you start updating on a working server, you’ll lose the database or get even more problems with the database. The old server works - transfer everything to the new one and only when the new one works normally, then you can bring the old one out and update, otherwise you can be left with nothing and it will be very problematic to roll back. There is a chance to get a working database when updating only if you update one step at a time, and even then there may be unsolvable problems.