Code Modification

I had this question after viewing RT - Data.

Hi Experts,

i need little modification in existing code.please help me out.
in attached WB Sheet main - Button Start Process - it will download zip files from server - unzip - post entries to respected file.it download data for duration between date - Cell G3 & Cell H3. after process completed in cell G3 date is change to last downloaded file date plus 1.

Need  modification
A) Change in download path i.e. fix download path in code it self instead of selecting in main sheet....path is D:\RTTrading\Data\
B) current process download data and past last date+1 in cell G3...so on next day if i click Start process button - it will delete all file and download new files and post to respective sheet .....but problem arise there ....i see only one entry in respected sheets ...i required macro dont delete old entries in respective sheet and post only new entries and limit entries to 30 row data (header is so in real term last data line is row 31).

See attached

Thanks
Sample.xlsm