First, I'm not sure that the scenario for winning the Spring Offensive would have won the war. Even if they were to have captured Paris, they would need to control it, and though England was pretty war-fatigued, they were in no danger of being toppled, and the Americans were still there to push on.
A more likely scenario for victory, in my opinion, would be any number of ways in which the US may have joined Germany in the war. Wilson loses the election, England continues executions in Ireland, something like that which would further inflame the (already at the time) rabidly anti-English feeling Stateside.
But were Germany to have won, it would have been a pretty half-hearted victory for the establishment. As it already was, there were tons of labour strikes and pro-communist movements that had to be put down. Had Germany been forced to, even temporarily, occupy France and make a blow to England they would have been fairly open to the socialist propaganda at the time.
The Soviet Union would have certainly have certainly aided such efforts for revolution - they themselves at the time believed that the revolution could well have hinged on internationalizing it.
Here exists several different scenarios. The most crass, non-ideological jingoists in the white movement may have well put on red hats in an attempt to thwart Germany while its back was turned, thus depriving the White elite of their footsoldiers and severely limiting a Russian Civil War. Or, the German workers and soldiers could have looked at their conditions, seen they had accomplished nothing for themselves, and marched on Berlin in the same way the Russian workers had. Or a combination of both.
It's unlikely that Lloyd George's government would have survived in England. They lost the war, lost (in theory) supremacy of the seas, almost certainly lost the UK as it's likely that some kind of deal was chartered out for Ireland - it's unlikely anyone would have followed that. I would predict Civil War here. Quite possibly more akin to Germany after the collapse of the Widmer Republic.
France, I suspect, would also go red. There was a movement for it in place already, and even if Germany was able to stave off hungery mobs of workers and returned soldiers that now had an ineffective and unsympathetic infrastructure in place, the Soviets would be naturally attractive for France as a potential liberator.
Things would hinge on Lenin and what he was able to do with what he had, and the United States. The United States would have backed a nation counter to its economic interests (as early as 1914 Connolly was predicting the US would join England as they had been trading - trades that England couldn't pay back if they had lost the war) and quite possibly suffered some kind of depression. It might also have tried to stay in Europe and counter the red tide, which would have been an interesting scenario that goes too far out there to even speculate on.
Anyway, the above are musings more than hard, concrete fact - as all counterfactuals are - but I tend to think that the communist movement would have been greatly strengthened and perhaps succeeded in the revolution at that point.
Alis Volat Propriis; Tiocfaidh ár lá; Proletarier Aller Länder, Vereinigt Euch!