Idea is  for DiMS to by  as simple as possible, some of services you listed are not really needed in my opinion.

1. How can I obtain the license file again, if I lost my license file?

- can't. You have to pay one more time or keep backup

2. Is it possible to create lite weight applications?

- It is easier for me to link many libraries, it will change in future but for now it add weight

3. What are the other developer platforms, DiMS can support?

- None, only c++ and QT. But any language interface  should be feasible

4. Is it possible to purchase a license from DiMS for web based playing games?

- there is no proper interface yet, but most likely yes

5. Can u host a server like steam, where developers list their apps for DiMS via purchase?

- Not right now, I am focusing on development of system itself  it takes me a lot of time

6. Is there any way I can add encrypted license key as signed message to the transaction?

- No

7. Is this project can be compared with Ethereum?

- It can't, this is massive transactions processing network but without any fancy functionalities

8. How can I acquire DiMS? Where can I buy? Can I Mine? What are the coin specs? What is the difference between dims and other altcoins?

- The only way is to burn  testnet bitcoins here: mh1xFXHEPZSgeKW8mrRUrXeJJyXTrc95ku
This is dead  address so those bitcoins are lost, in return you get equal amount of DiMS coins.
There is no blockchain as you know it, processing transactions works differently

9. How can DiMS ensure the refund if the developer offers to the user?

- It can't, maybe upper layer application will provide this but there are no tool to facilitate  that. 

10. Will DiMS wallet manage volatility in price while purchasing a license?

- No

11. Can u add referral payment system while paying for the license as the developer's referral payout system.

- I leave this up to developer

12. Is it possible to reward the user from a developer's server once he acheives some milestone in the game?

- no interface yet but this will be  possible

13. Will DiMS allow in-app purchases?

- no interface yet but this will be  possible

14. Can it be portable to mobile platforms?

- yes

15. Why the wallet and app are heavy in size?

- I am using many libraries especially from QT, those are heavy

16. Is it possible to monitor a worker and pay for his work using DiMS?

- at  some point but it is not the purpose of the system

17. Is there anyway to add auto-renewal system from the DiMS wallet?

- I think  yes, but there are better tools for this

18. Do wallet have the functionality to autopay rental, post pay for services?

- I think  yes, but there are better tools for this

19. Does it support Mass Payment functionality?

- I want to limit complex transaction those are burden on the network. 

20. I need to purchase in bulk, or multiple licenses with one single transaction, Can I?

- Not yet, maybe it could be done

21. I want to purchase a license for an app to be used in other machine may be remote, Can I?

- Not yet, maybe it could be done

22. How can DiMS collect cashback offers?

- DiMS does not know about a function of transactions it is  processing. It is matter of upper layers