Unable to purchase from marketplace (3.5 - Linux)

Code:

[02 Jan 2016 03:34:00,189] INFO   D20                       | D20PRO version: 3.5.5
[02 Jan 2016 03:34:00,385] INFO   D20                       | Java version: 1.8.0_66
[02 Jan 2016 03:34:00,502] WARN   HintsManager              | No hints file found at: res/ContextHints.xml
[02 Jan 2016 03:34:03,594] ERROR  HintsManager              | No message for key: welcome
[02 Jan 2016 03:34:11,562] WARN   WhatIsMyIPAddressWRP      | Unable to determine public IP
com.mindgene.common.util.net.CommunicationException: Failed invoking URL: http://www.d20pro.com/dl/myip.php
	at com.mindgene.d20.dm.options.WhatIsMyIPAddressWRP.resolvePublicIP(WhatIsMyIPAddressWRP.java:104)
	at com.mindgene.d20.common.live.LivePanel_LaunchJudge.resolveIP(LivePanel_LaunchJudge.java:92)
	at com.mindgene.d20.common.live.LivePanel_LaunchJudge.launch(LivePanel_LaunchJudge.java:81)
	at com.mindgene.d20.common.live.LivePanel_LaunchJudge.launch(LivePanel_LaunchJudge.java:31)
	at com.mindgene.d20.common.live.LivePanel_LaunchAbstract$LaunchAction$LaunchTask.logic(LivePanel_LaunchAbstract.java:331)
	at com.mindgene.d20.common.live.LivePanel_Abstract$AbstractPanelTask.work(LivePanel_Abstract.java:150)
	at com.mindgene.d20.laf.BlockerControl.run(BlockerControl.java:224)
	at java.lang.Thread.run(Thread.java:745)
	at com.mindgene.common.threading.SafeThread.safeRun(SafeThread.java:187)
	at com.mindgene.common.threading.SafeThread.run(SafeThread.java:195)
[02 Jan 2016 03:34:13,316] WARN   CreatureCapabilityTemplate_SpellCaster$Keys | Spell Iron Beard not installed
[02 Jan 2016 03:34:14,970] WARN   HintsManager              | No hints file found at: res/RandomHints.xml
[02 Jan 2016 03:34:44,970] INFO   AutoSaver                 | Autosaving...
[02 Jan 2016 03:34:45,002] DEBUG  AutoSaver                 | Autosave complete.
[02 Jan 2016 03:34:47,242] ERROR  MarketplaceNode           | There was an issue with your purchase
java.lang.UnsupportedOperationException: remove
	at com.mindgene.d20.dm.dlc.jfx.MarketplaceNode.peekCatalog(MarketplaceNode.java:156)
	at com.mindgene.d20.dm.dlc.jfx.MarketplaceNode$PurchaseProductLogic.safeRun(MarketplaceNode.java:632)
	at com.mindgene.common.threading.SafeRunnable.run(SafeRunnable.java:30)
	at java.lang.Thread.run(Thread.java:745)

 

Works swimmingly, though I still had to change the shell script to execute 3.5.6 properly.