Computer was showing no internet even though I was able to connect. Because of that Login in SambaMarket was unavailable.
I not sure if this was part of the issue but changing the ISP DNS server on the router with 8.8.8.8 and 192.168.1.1 (ISP router) seemed to show normal internet connection on the PC.
I also replaced clients License.dll with one from my PC\Documents folder and Login in SambaMarket showed up.
Yeah not the first time I had DNS issues here, SambaPOS Router (private sub network) picks up on default ISP DNS servers from the ISP router but sometimes they act like dummies and lead nowhere, so manual override is needed.
I always set google as network DNS on lan settings of router.
In fact even on devices as well. If setting manual ip details DNS usually goes to google first then local router seccond.