[Old School Runescape client issues]

Also I am not sure where this falls in the technical support option on the website

[Old School Runescape client issues]

I have a windows 8 HP desktop

[Old School Runescape client issues]

Can someone help me? I am sorry for posting it here but I am not to sure where to find a contact email for OsRs support, and I have tried to find solutions for this problem but haven't really found any. When I try and start the client, it pops up but then gives me this error:

Error downloading: browsercontrol_0_1928975093.jar

I am not really computer savy so I am not sure what this means. If anyone can help me with this that would be awesome!