I bought an EA, and synced it to a virtual server. I have started up MT4 again, and the strategy tester says 'invalid licence'.
How do i get around this?
Is this the only way?
Seller is slow in responding to my MQL5 message
No its not the only way you can also buy it again directly on the vps.
but then you pay twice and if support is slow/bad i would not want to do any business with the seller.
You deserve excellent service and support.