You can compile them yourself (not the signed ones I suppose). The RSLs are
compiled from corresponding SWCs. Here's just a copy-paste of my RSL config:
<flex-config>
<compiler>
<!--
!!! IMPORTANT !!!
MUST UPLOAD NEW SIGNED RSLS to CLOUDFRONT
Switching to build 14159 (aka release Flex SDK 4.0)
NOTE textLayout versioning change - it now has it's own versioning
The TLF version is 1.0.0.595
-->
</compiler>
<link-report>main-deps.xml</link-report>
<!-- TextLayout SWC -->
<runtime-shared-library-path>
<path-element>${FLEX_HOME}/frameworks/libs/textLayout.swc</path-element>
<rsl-url>
http://somewhere.cloudfront.net/art-for-sale/textLayout_4.0.0.8287.swz
</rsl-url>
<policy-file-url>http://somewhere.cloudfront.net/crossdomain.xml
</policy-file-url>
<rsl-url>
http://somewhere.cloudfront.net/art-for-sale/textLayout_1.0.0.595.swz
</rsl-url>
<policy-file-url></policy-file-url>
</runtime-shared-library-path>
<!-- Framework SWC -->
<runtime-shared-library-path>
<path-element>${FLEX_HOME}/frameworks/libs/framework.swc</path-element>
<rsl-url>
http://somewhere.cloudfront.net/art-for-sale/framework_4.0.0.8287.swz
</rsl-url>
<policy-file-url>http://somewhere.cloudfront.net/crossdomain.xml
</policy-file-url>
<rsl-url>
http://somewhere.cloudfront.net/art-for-sale/framework_4.0.0.14159.swz
</rsl-url>
<policy-file-url></policy-file-url>
</runtime-shared-library-path>
<!-- Spark SWC-->
<runtime-shared-library-path>
<path-element>${FLEX_HOME}/frameworks/libs/spark.swc</path-element>
<rsl-url>http://somewhere.cloudfront.net/art-for-sale/spark_4.0.0.8287.swz
</rsl-url>
<policy-file-url>http://somewhere.cloudfront.net/crossdomain.xml
</policy-file-url>
<rsl-url>http://somewhere.cloudfront.net/art-for-sale/spark_4.0.0.14159.swz
</rsl-url>
<policy-file-url></policy-file-url>
</runtime-shared-library-path>
<!-- RPC SWC -->
<runtime-shared-library-path>
<path-element>${FLEX_HOME}/frameworks/libs/rpc.swc</path-element>
<rsl-url>http://somewhere.cloudfront.net/art-for-sale/rpc_4.0.0.8287.swz
</rsl-url>
<policy-file-url>http://somewhere.cloudfront.net/crossdomain.xml
</policy-file-url>
<rsl-url>http://somewhere.cloudfront.net/art-for-sale/rpc_4.0.0.14159.swz
</rsl-url>
<policy-file-url></policy-file-url>
</runtime-shared-library-path>
</flex-config>
