where i can download old version of qbitorrent for windows x86

i have lot of problems with the lastest 309 and i want return to 308 or 306
Internet Protocol Version 6 (IPv6), is the full form of IPv6 which is the "next generation" protocol designed by the IETF to replace the current version Internet Protocol (IP Version 4 ("IPv4")).
Windows XP includes IPv6 implementation, but IPv6 must be installed.
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METHOD #1:
How to install and uninstall IPv6 in Windows XP (for all supported connections):
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To install IPv6 on your Windows XP computer, follow these steps:
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1) Click 'Start', click 'All Programs', click 'Accessories', and then click 'Command Prompt'.
2) At the command prompt, type "netsh int ipv6 install" (without quotation marks) and press the Enter key on your keyboard.
3) Wait for the 'OK', then close the Command Prompt window.
4) Restart the computer.
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To uninstall IPv6 on your Windows XP computer, follow these steps:
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1) Click 'Start', click 'All Programs', click 'Accessories', and then click 'Command Prompt'.
2) At the command prompt, type "netsh int ipv6 uninstall" (without quotation marks) and press the Enter key on your keyboard.
3) Wait for the 'OK', then close the Command Prompt window.
4) Restart the computer.
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METHOD #2:
How to install and uninstall IPv6 in Windows XP (for a specific connection):
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To install IPv6 on your Windows XP computer, follow these steps:
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1) Open 'Network Connections' in 'Control Panel'.
2) Right-click any 'Local Area Connection', and then click 'Properties'.
3) Click 'Install'.
4) In the 'Select Network Component Type' dialog box, click 'Protocol', and then click 'Add'.
5) In the 'Select Network Protocol' dialog box, click 'Microsoft TCP/IP version 6', and then click 'OK'.
6) When done, click 'Close' to save changes to your network connection.
7) Restart the computer.
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To uninstall IPv6 on your Windows XP computer, follow these steps:
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1) Open 'Network Connections' in 'Control Panel'.
2) Right-click any 'Local Area Connection', and then click 'Properties'.
3) Click 'Microsoft TCP/IP version 6' in the list of installed components, and then click 'Uninstall'.
4) In the 'Uninstall Microsoft TCP/IP version 6' dialog box, click 'Yes'.
5) When done, click 'Close' to save changes to your network connection.
6) Restart the computer.
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NOTE:
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When installing IPv6 in Windows XP, the process might actually also install MSN.
Make sure you remove this crap from 'Control Panel' -> 'Add or Remove Programs'.
Also, remember to remove the MSN connection manager from 'Control Panel' -> 'Network Connections'.